* Increase DNS timeout from 1 second to 5 seconds for MX check

1 seconds is rather short when using a recursive DNS resolver which
hasn't got a cached result already available. Use 5 seconds instead,
which is the timeout value we use for outgoing HTTP queries.

* Add more precise error messages for invalid e-mail addresses

* Fix client-side username validation at registration

It used the Account::USERNAME_RE regexp which is for *remote* users,
local user validation is stricter. Also take into account max username length.

* Add client-side form validation for password change

* Add client-side form validation to dedicated registration form

Previous changes only applied to the /about page, not the dedicated form on
/auth

* Add HTML-level validation of username in sign-up form

* Make required fields with incorrect values more visible

* Enable HTML form validation for the registration form

* Mark agreement checkbox as required client-side

* Add minimum length to password

* Add client-side password confirmation validation

Fixes #14523

Bumps [node-notifier](https://github.com/mikaelbr/node-notifier) from 7.0.1 to 7.0.2.
- [Release notes](https://github.com/mikaelbr/node-notifier/releases)
- [Changelog](https://github.com/mikaelbr/node-notifier/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mikaelbr/node-notifier/compare/v7.0.1...v7.0.2)

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Bumps minipass-pipeline from 1.2.3 to 1.2.4.

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Bumps [@testing-library/jest-dom](https://github.com/testing-library/jest-dom) from 5.11.0 to 5.11.2.
- [Release notes](https://github.com/testing-library/jest-dom/releases)
- [Changelog](https://github.com/testing-library/jest-dom/blob/master/CHANGELOG.md)
- [Commits](https://github.com/testing-library/jest-dom/compare/v5.11.0...v5.11.2)

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Bumps [dom-accessibility-api](https://github.com/eps1lon/dom-accessibility-api) from 0.4.6 to 0.4.7.
- [Release notes](https://github.com/eps1lon/dom-accessibility-api/releases)
- [Changelog](https://github.com/eps1lon/dom-accessibility-api/blob/main/CHANGELOG.md)
- [Commits](https://github.com/eps1lon/dom-accessibility-api/compare/v0.4.6...v0.4.7)

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Bumps [postcss-modules-local-by-default](https://github.com/css-modules/postcss-modules-local-by-default) from 3.0.2 to 3.0.3.
- [Release notes](https://github.com/css-modules/postcss-modules-local-by-default/releases)
- [Changelog](https://github.com/css-modules/postcss-modules-local-by-default/blob/master/CHANGELOG.md)
- [Commits](https://github.com/css-modules/postcss-modules-local-by-default/compare/v3.0.2...v3.0.3)

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Bumps [jest](https://github.com/facebook/jest) from 26.0.1 to 26.2.2.
- [Release notes](https://github.com/facebook/jest/releases)
- [Changelog](https://github.com/facebook/jest/blob/master/CHANGELOG.md)
- [Commits](https://github.com/facebook/jest/compare/v26.0.1...v26.2.2)

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Bumps [csstype](https://github.com/frenic/csstype) from 2.6.10 to 2.6.13.
- [Release notes](https://github.com/frenic/csstype/releases)
- [Commits](https://github.com/frenic/csstype/compare/v2.6.10...v2.6.13)

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Bumps [excon](https://github.com/excon/excon) from 0.75.0 to 0.76.0.
- [Release notes](https://github.com/excon/excon/releases)
- [Changelog](https://github.com/excon/excon/blob/master/changelog.txt)
- [Commits](https://github.com/excon/excon/compare/v0.75.0...v0.76.0)

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Bumps [eslint](https://github.com/eslint/eslint) from 7.5.0 to 7.6.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/eslint/eslint/compare/v7.5.0...v7.6.0)

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Bumps [pghero](https://github.com/ankane/pghero) from 2.6.0 to 2.7.0.
- [Release notes](https://github.com/ankane/pghero/releases)
- [Changelog](https://github.com/ankane/pghero/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ankane/pghero/compare/v2.6.0...v2.7.0)

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Fixes #14511

Bumps [rubocop-ast](https://github.com/rubocop-hq/rubocop-ast) from 0.2.0 to 0.3.0.
- [Release notes](https://github.com/rubocop-hq/rubocop-ast/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop-ast/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop-hq/rubocop-ast/compare/v0.2.0...v0.3.0)

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Bumps [elasticsearch](https://github.com/elastic/elasticsearch-ruby) from 7.8.0 to 7.8.1.
- [Release notes](https://github.com/elastic/elasticsearch-ruby/releases)
- [Changelog](https://github.com/elastic/elasticsearch-ruby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/elastic/elasticsearch-ruby/compare/v7.8.0...v7.8.1)

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Bumps [expect](https://github.com/facebook/jest/tree/HEAD/packages/expect) from 26.1.0 to 26.2.0.
- [Release notes](https://github.com/facebook/jest/releases)
- [Changelog](https://github.com/facebook/jest/blob/master/CHANGELOG.md)
- [Commits](https://github.com/facebook/jest/commits/v26.2.0/packages/expect)

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Bumps [@babel/preset-env](https://github.com/babel/babel/tree/HEAD/packages/babel-preset-env) from 7.10.4 to 7.11.0.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.11.0/packages/babel-preset-env)

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Bumps [aws-partitions](https://github.com/aws/aws-sdk-ruby) from 1.345.0 to 1.349.0.
- [Release notes](https://github.com/aws/aws-sdk-ruby/releases)
- [Changelog](https://github.com/aws/aws-sdk-ruby/blob/master/gems/aws-partitions/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-ruby/commits)

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* Fix contrast calculation for thumbnail color extraction

Luminance calculation was using 0-255 RGB values instead of 0-1 sRGB values,
leading to incorrectly-computed contrast values.

Since we use ColorDiff already, just use its XYZ colorspace conversion code
to get the value.

* Require at least 3:1 contrast for both accent and foreground colors

* Lower required contrast for the accent color

Fixes #14455

* Change content-type to be always computed from file data

Restore previous behavior, detecting the content-type isn't very
expensive, and some instances may serve files as application/octet-stream
regardless of their true type, making fetching media from them fail, while
it used to work pre-3.2.0.

* Add test

Fixes #14462

Also add missing PropTypes to the correct component

Fixes #14478

* Add tests

* Fix handling of Reject Follow when a matching follow relationship exists

Regression from #12199

* Bump eslint from 6.8.0 to 7.5.0

Bumps [eslint](https://github.com/eslint/eslint) from 6.8.0 to 7.5.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/eslint/eslint/compare/v6.8.0...v7.5.0)

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* Fix .codeclimate.yml

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Co-authored-by: Yamagishi Kazutoshi <ykzts@desire.sh>

Bumps [strong_migrations](https://github.com/ankane/strong_migrations) from 0.6.8 to 0.7.1.
- [Release notes](https://github.com/ankane/strong_migrations/releases)
- [Changelog](https://github.com/ankane/strong_migrations/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ankane/strong_migrations/compare/v0.6.8...v0.7.1)

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Bumps [posix-spawn](https://github.com/rtomayko/posix-spawn) from 58465d2e21 to 0.3.15. This release includes the previously tagged commit.
- [Release notes](https://github.com/rtomayko/posix-spawn/releases)
- [Commits](58465d2e21...v0.3.15)

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Bumps [sidekiq](https://github.com/mperham/sidekiq) from 6.1.0 to 6.1.1.
- [Release notes](https://github.com/mperham/sidekiq/releases)
- [Changelog](https://github.com/mperham/sidekiq/blob/master/Changes.md)
- [Commits](https://github.com/mperham/sidekiq/compare/v6.1.0...v6.1.1)

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Bumps [browserslist](https://github.com/browserslist/browserslist) from 4.12.0 to 4.13.0.
- [Release notes](https://github.com/browserslist/browserslist/releases)
- [Changelog](https://github.com/browserslist/browserslist/blob/master/CHANGELOG.md)
- [Commits](https://github.com/browserslist/browserslist/compare/4.12.0...4.13.0)

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Bumps [tty-prompt](https://github.com/piotrmurach/tty-prompt) from 0.21.0 to 0.22.0.
- [Release notes](https://github.com/piotrmurach/tty-prompt/releases)
- [Changelog](https://github.com/piotrmurach/tty-prompt/blob/master/CHANGELOG.md)
- [Commits](https://github.com/piotrmurach/tty-prompt/compare/v0.21.0...v0.22.0)

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Bumps [webpack](https://github.com/webpack/webpack) from 4.43.0 to 4.44.0.
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](https://github.com/webpack/webpack/compare/v4.43.0...v4.44.0)

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Bumps [@babel/core](https://github.com/babel/babel/tree/HEAD/packages/babel-core) from 7.10.3 to 7.10.5.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.10.5/packages/babel-core)

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Bumps [capistrano-rails](https://github.com/capistrano/rails) from 1.5.0 to 1.6.1.
- [Release notes](https://github.com/capistrano/rails/releases)
- [Commits](https://github.com/capistrano/rails/compare/v1.5.0...v1.6.1)

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Bumps [multi_json](https://github.com/intridea/multi_json) from 1.14.1 to 1.15.0.
- [Release notes](https://github.com/intridea/multi_json/releases)
- [Changelog](https://github.com/intridea/multi_json/blob/master/CHANGELOG.md)
- [Commits](https://github.com/intridea/multi_json/compare/v1.14.1...v1.15.0)

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Bumps [yargs](https://github.com/yargs/yargs) from 15.4.0 to 15.4.1.
- [Release notes](https://github.com/yargs/yargs/releases)
- [Changelog](https://github.com/yargs/yargs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/yargs/yargs/commits)

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Bumps [enhanced-resolve](https://github.com/webpack/enhanced-resolve) from 4.2.0 to 4.3.0.
- [Release notes](https://github.com/webpack/enhanced-resolve/releases)
- [Commits](https://github.com/webpack/enhanced-resolve/compare/v4.2.0...v4.3.0)

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Bumps [autoprefixer](https://github.com/postcss/autoprefixer) from 9.8.0 to 9.8.5.
- [Release notes](https://github.com/postcss/autoprefixer/releases)
- [Changelog](https://github.com/postcss/autoprefixer/blob/master/CHANGELOG.md)
- [Commits](https://github.com/postcss/autoprefixer/compare/9.8.0...9.8.5)

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