Accounts for Python 3.8 backported zoneinfo

src/documents/tests/test_document_model.py

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