math/saga: Update to 9.8.2
Small bugfix release.
Reported by: portscout, Repology
MFH: 2025Q3
Changelog: https://sourceforge.net/p/saga-gis/wiki/Changelog%209.8.2/attachment/changelog_saga_9.8.2.txt
(cherry picked from commit 2cb8677b523be0061778998d4b682f9beb900bf8)