Rails prefers require_dependency so that it won't require twice:

Closes #20724

lib/gitlab/email/receiver.rb

 
-require 'gitlab/email/handler'
+require_dependency 'gitlab/email/handler'
 
 # Inspired in great part by Discourse's Email::Receiver
 module Gitlab

lib/gitlab/request_profiler/middleware.rb

 require 'ruby-prof'
-require 'gitlab/request_profiler'
+require_dependency 'gitlab/request_profiler'
 
 module Gitlab
   module RequestProfiler