[PR] Stop SQLAlchemy subquery warning when loading the latest serialized Dag [airflow]

["roykoand (via GitHub)" <gi...@apache.org>]

roykoand opened a new pull request, #73461:
URL: https://github.com/apache/airflow/pull/73461

   On MySQL deployments every lookup of the latest serialized Dag emits a "implicitly coercing SELECT object to scalar subquery" SAWarning, so routine operations such as `airflow tasks clear` or opening the grid view spam the logs and bury warnings that actually matter. The generated SQL is identical either way.
   
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