BLD: Enable building Python 3.13 wheels for nightlies

[QuLogic]

PR summary

And also bump cibuildwheel, replacing #28265, which dependabot messed up.

PR checklist

• [n/a] "closes #0000" is in the body of the PR description to link the related issue
• new and changed code is tested
• [n/a] Plotting related features are demonstrated in an example
• [n/a] New Features and API Changes are noted with a directive and release note
• [n/a] Documentation complies with general and docstring guidelines

[QuLogic]

It looks like Pillow will have a release on or about July 1 which will have 3.13 wheels, so I'll wait till about then before looking at this again.

[zerothi]

This is somewhat related to this PR, when 3.13 hits the release, which versions of matplotlib will be supported under 3.13? How far will you go back and create wheels? (do you have a plan)

Thanks for this package!

[QuLogic]

It will be in whatever the next release is when 3.13 is ABI stable.

[QuLogic]

Pillow now has free-threading wheels on the nightly channel, so I've enabled testing as well (except for Windows, since NumPy doesn't have those wheels yet.) Of course, the testing is just an import check, and our extensions don't claim free-threading support, so it's not much of a test.

[QuLogic]

Looks like we'll need to skip cp313t-manylinux_aarch64 as there are no Pillow wheels there yet.

[tacaswell]

I'm going to go ahead and merge this.

[EwoutH]

Python 3.13rc1 is out now, which is ABI stable with future 3.13 releases. the latest cibuildwheel (2.20) uses it and builds 3.13 wheels by default.

What would be the fastest way to get 3.13 wheels on PyPI? Would a backport to the 3.9 branch be possible?

Edit: A PR to update cibuildwheel was already opened:

• Bump the actions group with 2 updates #28668

[tacaswell]

We will backport that cibuildwheel update to 3.9.x branch and the next release will have the additional wheels. In general we do not go back and rebuild wheels for already released versions.

[EwoutH]

Awesome that it can be backported, looking forward to matplotlib 3.9.2 with Python 3.13 wheels!