Merge pull request #10247 from chef/rubocop_Performance_SortReverse

Use sort.reverse instead of sort { |a, b| b <=> a }

lib/chef/util/backup.rb

@@ -87,7 +87,7 @@ def unsorted_backup_files
       end
 
       def sorted_backup_files
-        unsorted_backup_files.sort { |a, b| b <=> a }
+        unsorted_backup_files.sort.reverse # faster than sort { |a, b| b <=> a }
       end
     end
   end