graphics/qgis-ltr: Update to 3.22.8

In addition to the update, the write permissions for the world_map files
are also reset here, as recommended in PR 264761 by Bill Blake for
graphics/qgis. They should have been read-only for two years already
(PR 237070).

Changelog: https://github.com/qgis/QGIS/compare/final-3_22_7%5E...final-3_22_8