Adding support for 3.14 (WIP)

[clin1234]

Here's my fork so far: https://github.com/clin1234/maturin

I think pyo3 needs to also support 3.14 for the tests to pass...

[messense]

Thanks for the effort, but we are not going to add support for Python alpha releases, it will be added after 3.14 beta1 release, which is expected to be released on 2025-05-06.

[clin1234]

Just trying to make maturin work when beta1 comes out