Refs #23919 -- Removed django.test.mock Python 2 compatibility shim.

tests/user_commands/tests.py

@@ -1,5 +1,6 @@
 import os
 from io import StringIO
+from unittest import mock
 
 from admin_scripts.tests import AdminScriptTestCase
 
@@ -8,7 +9,7 @@ from django.core import management
 from django.core.management import BaseCommand, CommandError, find_commands
 from django.core.management.utils import find_command, popen_wrapper
 from django.db import connection
-from django.test import SimpleTestCase, mock, override_settings
+from django.test import SimpleTestCase, override_settings
 from django.test.utils import captured_stderr, extend_sys_path
 from django.utils import translation