Fix tests introduced in #45546 (#45572)

This was merged without letting tests pass somehow. We have removed the
`root_dag` argument in Airflow 3.

tests/api_connexion/endpoints/test_dag_run_endpoint.py

@@ -1531,7 +1531,7 @@ def test_action_logging(self, state, run_type, dag_maker, session):
         dag_run_id = "TEST_DAG_RUN_ID"
         with dag_maker(dag_id) as dag:
             task = EmptyOperator(task_id="task_id", dag=dag)
-        self.app.dag_bag.bag_dag(dag, root_dag=dag)
+        self.app.dag_bag.bag_dag(dag)
         dr = dag_maker.create_dagrun(run_id=dag_run_id, run_type=run_type)
         ti = dr.get_task_instance(task_id="task_id")
         ti.task = task