[rubygems/rubygems] Removed the depdendency of English library

English.rb is extracted to the default gems at
  2c5764ec22

https://github.com/rubygems/rubygems/commit/532f488c0b

lib/rubygems/commands/contents_command.rb

@@ -1,5 +1,4 @@
 # frozen_string_literal: true
-require 'English'
 require 'rubygems/command'
 require 'rubygems/version_option'
 
@@ -106,7 +105,8 @@ prefix or only the files that are requireable.
     spec.files.map do |file|
       case file
       when /\A#{spec.bindir}\//
-        [RbConfig::CONFIG['bindir'], $POSTMATCH]
+        # $' is POSTMATCH
+        [RbConfig::CONFIG['bindir'], $']
       when /\.so\z/
         [RbConfig::CONFIG['archdir'], file]
       else

lib/rubygems/commands/open_command.rb

@@ -1,5 +1,4 @@
 # frozen_string_literal: true
-require 'English'
 require 'rubygems/command'
 require 'rubygems/version_option'
 require 'rubygems/util'