style: [AXM-549] Remove unused import

Author: KyryloKireiev

lms/djangoapps/mobile_api/users/views.py

@@ -5,7 +5,7 @@
 
 import datetime
 import logging
-from typing import Dict, List, Optional
+from typing import Dict, List
 
 import pytz
 from completion.exceptions import UnavailableCompletionData