Support for Python 3.14?

[terrycojones]

Hello!

Does ete4 support 3.14? I was trying to get it to build (on OS X 15.7.1), but failed. I'm happy to say more and/or to help, but first wanted to ask what is actually supposed to work. It would be good if the pyproject.toml were more specific than just Python 3 and setup.py just says Python >= 3.7. A noxfile could also be good so people can easily run the tests against different versions.

Please let me know if I can help! And thanks again for ete :-)