graphics/qgis-ltr: Update to 3.22.4

This is the new LTR version, with a big version jump from 3.16.16.
The most important changes can be read at [1].

[1] https://www.qgis.org/de/site/forusers/visualchangelog322/index.html

Changelog: https://github.com/qgis/QGIS/compare/final-3_22_3%5E...final-3_22_4