math/saga: Update to 9.2.1

Some of the fixes of this bug fix release are:
- saga_api: fix more SG_ print macros
- saga_api: don't load interactive tools through saga_cmd
- saga_api, CSG_KDTree_3D::Get_Duplicates(): use kd_tree_3d instead 2d
- saga_gdi, CSG_3DView_Canvas::Draw_Line(): drawing lines out-of-range
- tool chains: add missing climate_tools_temperature_downscaling.xml
- PySAGA, Python: invalid escape sequences: refers to bug 308