Avoid Python 2 compat (conditional) imports. (#1167)

tests/unit/plugins/module_utils/_api/test_auth.py

@@ -16,6 +16,7 @@ import random
 import shutil
 import tempfile
 import unittest
+from unittest import mock
 
 import pytest
 
@@ -28,12 +29,6 @@ from ansible_collections.community.docker.plugins.module_utils._api.credentials.
 )
 
 
-try:
-    from unittest import mock
-except ImportError:
-    import mock
-
-
 class RegressionTest(unittest.TestCase):
     def test_803_urlsafe_encode(self):
         auth_data = {"username": "root", "password": "GR?XGR?XGR?XGR?X"}