Fixes ruff not running isort against the codebase

src/documents/tests/test_management_thumbnails.py

@@ -4,6 +4,7 @@ from unittest import mock
 
 from django.core.management import call_command
 from django.test import TestCase
+
 from documents.management.commands.document_thumbnails import _process_document
 from documents.models import Document
 from documents.tests.utils import DirectoriesMixin