databases/postgresql-mysql_fdw: Update from REL-2_9_0 to REL-2_9_1
Changelog: * Support for PostgreSQL 16 and EDB Postgres Advanced Server 16. * Added a few more default entries in mysql_fdw_pushdown.config file. * Fixes incorrect quoting in generating EXPLAIN query. * Remove support for v10.
PR: 279191
Reported by: kbowling