Fix overzealous ruff check --fix

Author: dandavison

tests/worker/workflow_sandbox/test_importer.py

@@ -19,7 +19,7 @@
 def test_workflow_sandbox_importer_invalid_module():
     with pytest.raises(RestrictedWorkflowAccessError) as err:
         with Importer(restrictions, RestrictionContext()).applied():
-            pass
+            import tests.worker.workflow_sandbox.testmodules.invalid_module  # noqa: F401
     assert (
         err.value.qualified_name
         == "tests.worker.workflow_sandbox.testmodules.invalid_module"