Fix tests

Author: r4victor

src/tests/_internal/server/background/pipeline_tasks/test_submitted_jobs.py

@@ -1,6 +1,7 @@
 import asyncio
 import uuid
 from datetime import timedelta
+from typing import cast
 from unittest.mock import Mock, patch
 
 import pytest
@@ -538,7 +539,8 @@ async def test_defers_new_capacity_provisioning_until_fleet_master_is_elected(
         assert job.lock_owner is None
         assert job.lock_token is None
         assert job.lock_expires_at is None
-        worker._pipeline_hinter.hint_fetch.assert_called_once_with(FleetModel.__name__)
+        hint_fetch = cast(Mock, worker._pipeline_hinter.hint_fetch)
+        hint_fetch.assert_called_once_with(FleetModel.__name__)
 
     async def test_provisioning_non_master_job_ignores_cluster_master_fleet_lock(
         self, test_db, session: AsyncSession, worker: JobSubmittedWorker