math/saga: Update to 9.2.0

Besides new features, improvements and fixes, the most important
changes are in the new PySAGA Python package, which was already
introduced with v9.1.0. There is now a direct access from Python
to most of the SAGA tools, see
https://sourceforge.net/p/saga-gis/news/2023/10/saga-920-released/

Changelog: https://sourceforge.net/p/saga-gis/wiki/Changelog%209.2.0/attachment/changelog_saga_9.2.0.txt

Reported by: Repology