Looks like the library is using the deprecated dbapi_connection.connection and should switch to dbapi_connection.driver_connection

There are several occurrences in sqlalchemy_spanner.py

This recreates when using SQLAlchemy.

SADeprecationWarning: The _ConnectionFairy.connection attribute is deprecated; please use 'driver_connection' (deprecated since: 2.0)   dbapi_connection = dbapi_connection.connection