let bundler fetch http_parser.rb submodules (#11444)

Gemfile

@@ -52,7 +52,7 @@ gem 'redis-namespace', '~> 1.5'
 gem 'htmlentities', '~> 4.3'
 gem 'http', '~> 3.3'
 gem 'http_accept_language', '~> 2.1'
-gem 'http_parser.rb', '~> 0.6', git: 'https://github.com/tmm1/http_parser.rb', ref: '54b17ba8c7d8d20a16dfc65d1775241833219cf2'
+gem 'http_parser.rb', '~> 0.6', git: 'https://github.com/tmm1/http_parser.rb', ref: '54b17ba8c7d8d20a16dfc65d1775241833219cf2', submodules: true
 gem 'httplog', '~> 1.3'
 gem 'idn-ruby', require: 'idn'
 gem 'kaminari', '~> 1.1'

Gemfile.lock

@@ -22,6 +22,7 @@ GIT
   remote: https://github.com/tmm1/http_parser.rb
   revision: 54b17ba8c7d8d20a16dfc65d1775241833219cf2
   ref: 54b17ba8c7d8d20a16dfc65d1775241833219cf2
+  submodules: true
   specs:
     http_parser.rb (0.6.1)