style: fix unused imports

learning_assistant/api.py

@@ -1,9 +1,8 @@
 """
 Library for the learning_assistant app.
 """
-import datetime
 import logging
-from datetime import datetime, timedelta
+from datetime import timedelta
 
 from django.conf import settings
 from django.contrib.auth import get_user_model

tests/test_api.py

@@ -2,7 +2,6 @@
 Test cases for the learning-assistant api module.
 """
 import itertools
-import zoneinfo
 from datetime import datetime, timedelta
 from unittest.mock import MagicMock, patch