test: support python >=3.7 for ansible-test (#235)

* test: only test for python >=3.7

* refactor: remove python 2 utc timezone workaround

plugins/module_utils/utc.py

@@ -1,24 +0,0 @@
-from __future__ import absolute_import, division, print_function
-
-__metaclass__ = type
-
-from datetime import timedelta, tzinfo
-
-ZERO = timedelta(0)
-HOUR = timedelta(hours=1)
-
-
-class UTC(tzinfo):
-    """Custom UTC for compatibility with Python 2.7"""
-
-    def utcoffset(self, dt):
-        return ZERO
-
-    def tzname(self, dt):
-        return "UTC"
-
-    def dst(self, dt):
-        return ZERO
-
-
-utc = UTC()

plugins/modules/hcloud_server.py

@@ -335,8 +335,7 @@ hcloud_server:
 from ansible.module_utils.basic import AnsibleModule
 from ansible.module_utils._text import to_native
 from ansible_collections.hetzner.hcloud.plugins.module_utils.hcloud import Hcloud
-from ansible_collections.hetzner.hcloud.plugins.module_utils.utc import utc
-from datetime import timedelta, datetime
+from datetime import timedelta, datetime, timezone
 
 try:
     from hcloud.volumes.domain import Volume
@@ -544,7 +543,7 @@ class AnsibleHcloudServer(Hcloud):
         if server_type.deprecation is None:
             return
 
-        if server_type.deprecation.unavailable_after < datetime.now(utc):
+        if server_type.deprecation.unavailable_after < datetime.now(timezone.utc):
             self.module.warn(
                 'Attention: The server plan %s is deprecated and can no longer be ordered. Existing servers of ' % server_type.name
                 + 'that plan will continue to work as before and no action is required on your part. It is possible '

tests/config.yml

@@ -0,0 +1,3 @@
+---
+modules:
+  python_requires: ">=3.7"