graphics/qgis: Update to 3.30.3

Bugfix release. While here, also
- Add USE_QT=multimedia, testlib
- Add CMAKE_ARGS+=-DPG_CONFIG=1
- Fix cmake configure: If PostgreSQL server and client are present,
  the 'About' dialog does not show the PostgreSQL version any more

Changelog: https://github.com/qgis/QGIS/compare/final-3_30_2%5E...final-3_30_3

Reported by:	portscout, Repology
MFH:		2023Q2