devel/py-oslo.db: Fix build after 59c51372a83e96bcd8314a60bf91a0d82a9f0f94

• Change RUN_DEPENDS from py-sqlalchemy14 to py-sqlalchemy20
• Bump PORTREVISION for dependency change

Reference: https://pkg-status.freebsd.org/beefy22/data/142amd64-default/4ff0a7ba4d1f/logs/py311-oslo.db-17.1.0.log

		https://pkg-status.freebsd.org/beefy21/data/142i386-default/4ff0a7ba4d1f/logs/py311-oslo.db-17.1.0.log