chore: apply ruff formatting

Author: Kundan-CR7

airflow-core/tests/unit/models/test_variable.py

@@ -444,6 +444,7 @@ def test_masking_only_secret_values(variable_value, deserialize_json, expected_m
     finally:
         db.clear_db_variables()
 
+
 @mock.patch("airflow.models.variable.ensure_secrets_loaded")
 def test_check_for_write_conflict_multiple_backends(self, mock_ensure_secrets):
     # First backend returns None (no conflict)