Flaky MappedTaskUpstreamDep test `test_mapped_task_upstream_dep` on Postgres

### Body This new functional was added in #37498 however test [`tests/ti_deps/deps/test_mapped_task_upstream_dep.py::test_step_by_step`](https://github.com/apache/airflow/blob/main/tests/ti_deps/deps/test_mapped_task_upstream_dep.py#L160) failed on regular basis on Postgres Database This is might be a side effect of other test or potentially something wrong with Postgres implementation Example failure: ```console _____________________ test_step_by_step[task-True-failed] ______________________ dag_maker = <tests.conftest.dag_maker.<locals>.DagFactory object at 0x7f68e707e280> session = <sqlalchemy.orm.session.Session object at 0x7f691fcbd1f0> failure_mode = <TaskInstanceState.FAILED: 'failed'>, skip_upstream = True testcase = 'task' @pytest.mark.parametrize("failure_mode", [None, FAILED, UPSTREAM_FAILED]) @pytest.mark.parametrize("skip_upstream", [True, False]) @pytest.mark.parametrize("testcase", ["task", "group"]) def test_step_by_step( dag_maker, session: Session, failure_mode: TaskInstanceState | None, skip_upstream: bool, testcase: str ): from airflow.decorators import task, task_group with dag_maker(session=session): @task def t1(): return [0] @task def t2_a(): if failure_mode == UPSTREAM_FAILED: raise AirflowFailException() return [1, 2] @task def t2_b(x): if failure_mode == FAILED: raise AirflowFailException() return x @task def t3(): if skip_upstream: raise AirflowSkipException() return [3, 4] @task def t4(): return 17 @task(trigger_rule="all_done") def m1(a, x, y, z): return a + x + y + z @task(trigger_rule="all_done") …