Modify the password for a connection pool

RDS authentication tokens expire. These tokens are passed to a connection pool via the password field. When a token expires, the connection pool becomes permanently unable to create new database connections. Thus the pool must be discarded and a new pool created which is a huge hassle because -- if you want your application to exit gracefully -- connection pools must be closed explicitly during shut-down.

This is no different from the case where a database user's password has been changed. However, while this is a rare occurrence, auth tokens are meant to expire.

Would it be possible to modify the password used by a connection pool? Or is this already possible?