Modernize some Python constructs (#876)

* Update __future__ import, remove __metaclass__ assignment.

* Removing obsolete encoding comment.

* Remove unneccessary object inheritance.

plugins/modules/openssl_csr_pipe.py

@@ -1,15 +1,10 @@
 #!/usr/bin/python
-# -*- coding: utf-8 -*-
-
 # Copyright (c) 2017, Yanis Guenane <yanis+ansible@guenane.org>
 # 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
 
 
 DOCUMENTATION = r"""
@@ -142,7 +137,7 @@ from ansible_collections.community.crypto.plugins.module_utils.crypto.module_bac
 )
 
 
-class CertificateSigningRequestModule(object):
+class CertificateSigningRequestModule:
     def __init__(self, module, module_backend):
         self.check_mode = module.check_mode
         self.module = module