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

tests/migrations/test_autodetector.py

@@ -1,5 +1,6 @@
 import functools
 import re
+from unittest import mock
 
 from django.apps import apps
 from django.conf import settings
@@ -11,7 +12,7 @@ from django.db.migrations.graph import MigrationGraph
 from django.db.migrations.loader import MigrationLoader
 from django.db.migrations.questioner import MigrationQuestioner
 from django.db.migrations.state import ModelState, ProjectState
-from django.test import TestCase, mock, override_settings
+from django.test import TestCase, override_settings
 from django.test.utils import isolate_lru_cache
 
 from .models import FoodManager, FoodQuerySet