ci: build Python 3.14 wheels

[cpmpercussion]

This adds Python 3.14 wheels to the cibuildwheel setup:

• adds cp314 to the Linux, macOS and Windows build patterns, and a 3.14 classifier
• updates cibuildwheel from v2.22 to v4.2.1 (v2.22 is older than 3.14 support)
• turns on pypy-eol, since cibuildwheel moved PyPy 3.9 and 3.10 behind that flag, so those wheels still build

I tested it on my fork: https://github.com/cpmpercussion/python-rtmidi/actions/runs/36222808282. With this, a 1.6.0 release would have wheels for 3.13 and 3.14 (see #217).

[Copilot]

Copilot review overview

🟢 Approval recommended

No unresolved review comments remain.

Review effort: Lite
Findings: None

What changed in this PR

Adds Python 3.14 wheel support and updates cibuildwheel while preserving legacy PyPy builds.

Changes:

• Adds Python 3.14 classifiers and build selectors.
• Enables EOL PyPy builds.
• Upgrades cibuildwheel to v4.2.1 across workflows.

File	Description
pyproject.toml	Adds Python 3.14 and updates wheel targets.
.github/​workflows/​release.yml	Updates cibuildwheel for releases.
.github/​workflows/​push_to_master.yml	Updates cibuildwheel for TestPyPI builds.
.github/​workflows/​pr_to_master.yml	Updates cibuildwheel for pull-request builds.

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[iDoMeteor]

Thanks for this. Once it's merged, adding cp314t-* to the cibuildwheel build patterns would also produce free-threaded wheels. With #230, importing rtmidi no longer turns the GIL back on, so those wheels would actually run free-threaded. I'm happy to send that as a small follow-up after this lands, so it doesn't widen this PR.

[shauneccles]

Any chance you can add python 3.15 wheels to this? It's ABI stable and buildable/uploadable to pypi, would be great to land them both together.

[iDoMeteor]

Will do!

…

On Mon, Oct 5, 2026 at 6:15 AM Shaun Eccles-Smith ***@***.***> wrote: *shauneccles* left a comment (SpotlightKid/python-rtmidi#229) <#229 (comment)> Any chance you can add python 3.15 wheels to this? It's ABI stable and buildable/uploadable to pypi, would be great to land them both together. — Reply to this email directly, view it on GitHub <#229?email_source=notifications&email_token=ACZWVPHL6VQOPBOEFO7UBVL5SNYCNA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKOJZGI2DINZWGM32M4TFMFZW63VHMNXW23LFNZ2KKZLWMVXHJLDGN5XXIZLSL5RWY2LDNM#issuecomment-5992447637>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACZWVPHI4EC22F3L3GTZWQD5SNYCNAVCNFSNUABEKJSXA33TNF2G64TZHMZTQMBQGI2DKNB3JFZXG5LFHM2TKOJRHA4DSOBYGSQXMAQ> . Triage notifications, keep track of coding agent tasks and review pull requests on the go with GitHub Mobile for iOS <https://github.com/notifications/mobile/ios/ACZWVPB2SHAMSYMYIIEIGCL5SNYCNA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKOJZGI2DINZWGM32M4TFMFZW63VHMNXW23LFNZ2KKZLWMVXHJKTGN5XXIZLSL5UW64Y> and Android <https://github.com/notifications/mobile/android/ACZWVPFQ3HV4ENFVSD5I5JD5SNYCNA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKOJZGI2DINZWGM32M4TFMFZW63VHMNXW23LFNZ2KKZLWMVXHJLTGN5XXIZLSL5QW4ZDSN5UWI>. Download it today! You are receiving this because you commented.Message ID: ***@***.***>

[iDoMeteor]

@shauneccles 3.15 wheels are in #232. It's stacked on this PR (it includes this commit plus one for 3.15), so both can land together. The full wheel workflow passed on Linux, macOS and Windows.