Modernize some Python constructs (#876)

* Update __future__ import, remove __metaclass__ assignment.

* Removing obsolete encoding comment.

* Remove unneccessary object inheritance.

plugins/module_utils/argspec.py

@@ -1,14 +1,8 @@
-# -*- coding: utf-8 -*-
-#
 # Copyright (c) 2020, Felix Fontein <felix@fontein.de>
 # GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-from __future__ import absolute_import, division, print_function
-
-
-__metaclass__ = type
-
+from __future__ import annotations
 
 from ansible.module_utils.basic import AnsibleModule
 
@@ -83,7 +77,7 @@ class ArgumentSpec:
             required_one_of=self.required_one_of,
             required_if=self.required_if,
             required_by=self.required_by,
-            **kwargs
+            **kwargs,
         )
 
     def create_ansible_module(self, **kwargs):