Don't use pkg_version when cleaning the cache

Fixes Homebrew/homebrew#27245.

Library/Homebrew/cmd/cleanup.rb

@@ -68,7 +68,8 @@ module Homebrew extend self
         next
       end
 
-      if f.version > version || ARGV.switch?('s') && !f.installed? || bottle_file_outdated?(f, file)
+      v = f.stable.version || f.devel.version || f.head.version
+      if v > version || ARGV.switch?('s') && !f.installed? || bottle_file_outdated?(f, file)
         cleanup_cached_file(file)
       end
     end