[rubygems/rubygems] Remove explicit require for autoloaded constant

https://github.com/rubygems/rubygems/commit/a54230093e

lib/rubygems/dependency_installer.rb

@@ -5,7 +5,6 @@ require 'rubygems/package'
 require 'rubygems/installer'
 require 'rubygems/spec_fetcher'
 require 'rubygems/user_interaction'
-require 'rubygems/source'
 require 'rubygems/available_set'
 require 'rubygems/deprecate'
 

lib/rubygems/source_list.rb

@@ -1,5 +1,4 @@
 # frozen_string_literal: true
-require 'rubygems/source'
 
 ##
 # The SourceList represents the sources rubygems has been configured to use.