Drop support for 3.13t

[ngoldbaum]

What do these changes do?

See the note at https://cibuildwheel.pypa.io/en/stable/changelog/#v341 and pypa/cibuildwheel#2787.

The cpython-freethreading option will be removed in the next release of cibuildwheel. I also took the opportunity to drop 3.13t CI.

I'm going through repositories on GitHub that enable this option and sending in PRs to disable it. Happy to answer questions about this.

If you're curious why 3.13t support is going away so soon, see https://py-free-threading.github.io/ci/#building-free-threaded-wheels-with-cibuildwheel for further guidance.

Are there changes in behavior for the user?

The next release of yarl won't include 3.13t wheels.

Related issue number

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes

[codspeed-hq]

Merging this PR will not alter performance

✅ 99 untouched benchmarks

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_{Comparing ngoldbaum:rm-3.13t-builds (ed178b9) with master (e522ab0)}