Python code modernization, 3/n (#1157)

* Remove __metaclass__ = type.

for i in $(grep -REl '__metaclass__ = type' plugins/ tests/); do
  sed -e '/^__metaclass__ = type/d' -i $i;
done

* Remove super arguments, and stop inheriting from object.

tests/unit/plugins/module_utils/test__util.py

@@ -4,9 +4,6 @@
 
 from __future__ import annotations
 
-
-__metaclass__ = type
-
 import pytest
 from ansible_collections.community.docker.plugins.module_utils._util import (
     compare_dict_allow_more_present,