### Apache Airflow version

Other Airflow 2 version (please specify below)

### What happened

ON Airflow 2.4.2 Dag dependencies graph show deleted DAGs that use to have dependencies to currently existing DAGs

### What you think should happen instead

Deleted DAGs should not appear on DAG Dependencies

### How to reproduce

Create a DAG with dependencies on other DAG, like a wait sensor.
Remove new DAG

### Operating System

apache/airflow:2.4.2-python3.10

### Versions of Apache Airflow Providers

_No response_

### Deployment

Official Apache Airflow Helm Chart

### Deployment details

_No response_

### Anything else

_No response_

### Are you willing to submit PR?

- [ ] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)

"""
        Saves DAGs as Serialized DAG objects in the database. Each
        DAG is saved in a separate database query.
        :param dags: the DAG objects to save to the DB
        :param session: ORM Session
        :return: None
        """
        for dag in dags:
            if not dag.is_subdag:
                SerializedDagModel.write_dag(
                    dag=dag,
                    min_update_interval=MIN_SERIALIZED_DAG_UPDATE_INTERVAL,
                    processor_subdir=processor_subdir,
                    session=session,
                )
    @classmethod
    @provide_session
    def get_last_updated_datetime(cls, dag_id: str, session: Session = None) -> datetime | None: