Removes support for Python 3.8 and lower from the code base

src/documents/tests/test_document_model.py

@@ -1,13 +1,9 @@
 import shutil
 import tempfile
+import zoneinfo
 from pathlib import Path
 from unittest import mock
 
-try:
-    import zoneinfo
-except ImportError:
-    from backports import zoneinfo
-
 from django.test import TestCase
 from django.test import override_settings
 from django.utils import timezone