Refs #32365 -- Removed internal uses of utils.timezone.utc alias.

Remaining test case ensures that uses of the alias are mapped
canonically by the migration writer.

tests/staticfiles_tests/storage.py

@@ -1,10 +1,9 @@
 import os
-from datetime import datetime, timedelta
+from datetime import datetime, timedelta, timezone
 
 from django.conf import settings
 from django.contrib.staticfiles.storage import ManifestStaticFilesStorage
 from django.core.files import storage
-from django.utils import timezone
 
 
 class DummyStorage(storage.Storage):