Fixed #29595 -- Allowed using timedelta in migrations questioner.

Refs #29600 -- Removed usage of django.utils.datetime_safe in migrations.

tests/migrations/test_questioner.py

@@ -1,6 +1,11 @@
-from django.db.migrations.questioner import MigrationQuestioner
+import datetime
+from unittest import mock
+
+from django.db.migrations.questioner import (
+    InteractiveMigrationQuestioner, MigrationQuestioner,
+)
 from django.test import SimpleTestCase
-from django.test.utils import override_settings
+from django.test.utils import captured_stdout, override_settings
 
 
 class QuestionerTests(SimpleTestCase):
@@ -11,3 +16,10 @@ class QuestionerTests(SimpleTestCase):
     def test_ask_initial_with_disabled_migrations(self):
         questioner = MigrationQuestioner()
         self.assertIs(False, questioner.ask_initial('migrations'))
+
+    @mock.patch('builtins.input', return_value='datetime.timedelta(days=1)')
+    def test_timedelta_default(self, mock):
+        questioner = InteractiveMigrationQuestioner()
+        with captured_stdout():
+            value = questioner._ask_default()
+        self.assertEqual(value, datetime.timedelta(days=1))