Update to Python 3.14

[rhugonnet]

Mirrors GlacioHack/xdem#794

[remi-braun]

Hello !
Would this part of the next release? 🙏

[rhugonnet]

Hard to know, as we're waiting on Rasterio 😅 , which currently doesn't install on Python 3.14 (see here for example: https://github.com/GlacioHack/geoutils/actions/runs/19243649274/job/55012393671?pr=744; I tested and it also failed to install locally).