Prepare 5.0.0 (#1123)

* Bump version to 5.0.0-a1.

* Drop support for ansible-core 2.15 and 2.16.

* Remove Python 2 and early Python 3 compatibility.

plugins/connection/nsenter.py

@@ -5,8 +5,7 @@
 # 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"""
 name: nsenter
@@ -42,6 +41,7 @@ notes:
 
 import os
 import pty
+import selectors
 import subprocess
 import fcntl
 
@@ -52,8 +52,6 @@ from ansible.plugins.connection import ConnectionBase
 from ansible.utils.display import Display
 from ansible.utils.path import unfrackpath
 
-from ansible_collections.community.docker.plugins.module_utils.selectors import selectors
-
 
 display = Display()