fix: fix isort error

Author: UsamaSadiq

submissions/tests/test_viewsets.py

@@ -20,8 +20,8 @@
 from submissions.models import ExternalGraderDetail, SubmissionFile
 from submissions.permissions import IsXQueueUser
 from submissions.tests.factories import ExternalGraderDetailFactory, SubmissionFactory
-from submissions.views.xqueue import XQueueViewSet
-from submissions.views.xqueue import MAX_SCORE_UPDATE_RETRIES
+from submissions.views.xqueue import MAX_SCORE_UPDATE_RETRIES, XQueueViewSet
+
 User = get_user_model()