require login for tag api

app/controllers/api/v1/timelines/tag_controller.rb

@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 class Api::V1::Timelines::TagController < Api::BaseController
+  before_action :require_user!
   before_action :load_tag
   after_action :insert_pagination_headers, unless: -> { @statuses.empty? }