CGA-pr6q-7rqh-9w3r

CVE-2015-7764 remains unresolved due to concerns about potential breaking backwards compatibility and due to sqlalchemy-utils low maintiner activity. Airflow-2 maintainers will need to either remove their dependency on sqlalchemy-utils or wait for a fix from sqlalchemy-utils maintainers. Reference: https://github.com/kvesteri/sqlalchemy-utils/issues/166