Update ARCCnet to more recent python version

[DanGass]

The current codebase is running on Python 3.9.x, which is deprecated for many of the required libraries (SunPy for example), and will be lagging behind documentation in a lot of instances. We should update existing code and write new code to a more recent version of Python. (Most recent stable version is 3.13)

[samaloney]

Totally agree but this needs to be coordinated with a possibly reprocessing of all exiting data and retraining of the models so isn't trivial. Also have similar issue with versions of python packages e.g see this comment

Also most of the major packages keep at least a few older releases of their docs available so unless there some specific bug fix or new feature we need should aim to use the versions currently specified