fix pylint errors

backend/tests/routers/test_shipments.py

@@ -1,12 +1,11 @@
-import src.shipments.service as service
-import src.models as models
-from src.main import app
 import src.messages as messages
 import src.shipments.exceptions as exceptions
-from src.auth.auth import get_current_user
+import src.shipments.service as service
 import tests.factories.shipments as shipment_factory
-
 from fastapi.exceptions import HTTPException
+from src import models
+from src.auth.auth import get_current_user
+from src.main import app
 
 
 class TestShipments: