Update python to current supported versions. Also add experimental support for next python release

[Fale]

Description

Bump python version in the CI to current versions.

[Fale]

I've added back 3.9 and 3.10. Also I've pushed 3.12 to be ok to fail, since now it is failing. The best scenario would be to have up to 3.13 working properly, considering that 3.13 is already in Fedora 41 (released last month) and very soon other distros will move to it

[snejus]

I see that you're dropping support for Python 3.8 - note that this needs a bit more effort:

1. Looking through the release notes, checking the codebase against any removals/deprecations and updating the codebase accordingly.
2. Typing updates: we should use pyupgrade to align types used in the codebase with what Python 3.9 supports.
3. Update of Python constraints in the package.
4. Relevant updates in the documentation.
5. And finally the changelog note.

That's a couple of things just off the top of my head - there's likely a couple of others.

Are you happy to go ahead with the above or would you like to limit the scope of this PR to simply add support for the most recent version without removing Python 3.8?

[Fale]

I've added back 3.8.

The reason why I removed it in the first place was that it is EOL, but I don't mind it being there. The part I'm interested into is the support to the newest versions. I don't have anything against the old versions :).