Update _test_settings fixture to work with Django 4.1 and 4.2 (#507)

tests/conftest.py

@@ -59,7 +59,9 @@ kwIDAQAB
 
 @pytest.fixture(autouse=True)
 def _test_settings(settings):
-    settings.STATICFILES_STORAGE = None
+    settings.STATICFILES_STORAGE = (
+        "django.contrib.staticfiles.storage.StaticFilesStorage"
+    )
 
 
 @pytest.fixture