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/modules/docker_compose_v2_exec.py

@@ -4,8 +4,7 @@
 # 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"""
@@ -169,7 +168,6 @@ import shlex
 import traceback
 
 from ansible.module_utils.common.text.converters import to_text, to_native
-from ansible_collections.community.docker.plugins.module_utils._six import string_types
 
 from ansible_collections.community.docker.plugins.module_utils.common_cli import (
     AnsibleModuleDockerClient,
@@ -210,7 +208,7 @@ class ExecManager(BaseComposeManager):
 
         if self.env is not None:
             for name, value in list(self.env.items()):
-                if not isinstance(value, string_types):
+                if not isinstance(value, str):
                     self.fail(
                         "Non-string value found for env option. Ambiguous env options must be "
                         "wrapped in quotes to avoid them being interpreted. Key: %s" % (name, )