Add Python 3.12 to CIs

[mscheltienne]

Let's see how long it takes torch and onnxruntime to work :)

Depends on:

• [Feature Request] Python 3.12 support microsoft/onnxruntime#17842
• Pytorch for Python 3.12 not available pytorch/pytorch#110436

[mscheltienne]

This fix: borgbackup/borg#7592
Looks good, but should be added to mne-python, for now we'll ignore this warning in mne-icalabel.

[mscheltienne]

Nevermind, it should be fixed in pooch directly.