[1.8.x] Sorted imports with isort; refs #23860.

Backport of 0ed7d15563 from master

tests/utils_tests/test_datetime_safe.py

@@ -1,6 +1,9 @@
 import unittest
+from datetime import (
+    date as original_date, datetime as original_datetime,
+    time as original_time,
+)
 
-from datetime import date as original_date, datetime as original_datetime, time as original_time
 from django.utils.datetime_safe import date, datetime, time