Support Python=3.12 :snake:

[valeriupredoi]

It's stable, with a solid ABI etc - we should start supporting it 🐍 @zklaus @bouweandela I can fire up PRs to get it in before 2.10 is out if you guys consider we should do this, there may be problems when releasing Tool though (dunno!), or I can move the work to 2.11 -> up to you 🍺

EDIT #2228 is still very young, so no way jose we can get anything done by 2.10 👍