Modernize some Python constructs (#876)

* Update __future__ import, remove __metaclass__ assignment.

* Removing obsolete encoding comment.

* Remove unneccessary object inheritance.

plugins/modules/luks_device.py

@@ -3,10 +3,7 @@
 # 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"""
@@ -479,7 +476,7 @@ def wipe_luks_headers(device):
                 f.write(b"\x00\x00\x00\x00\x00\x00")
 
 
-class Handler(object):
+class Handler:
 
     def __init__(self, module):
         self._module = module