Merge pull request #8426 from rolandwalker/homebrew_remove_extend_pathname_version

remove homebrew-fork extend `Pathname#version`

lib/homebrew-fork/Library/Homebrew/extend/pathname.rb

@@ -18,11 +18,6 @@ class Pathname
     false
   end
 
-  def version
-    require 'version'
-    Version.parse(self)
-  end
-
   # FIXME eliminate the places where we rely on this method
   alias_method :to_str, :to_s unless method_defined?(:to_str)