Build cp314 wheels: bump cibuildwheel, keep the manylinux baseline

[Igor-Techsee]

The bug

CIBW_BUILD already asks for cp314-* (added in 5a3bc4d, "add python 3.14, drop python 3.9"), but pypa/cibuildwheel@v2.23.3 doesn't know that build identifier. The selector matches nothing, the job still succeeds, and the release publishes cp310–cp313 only.

That's why 0.33.5 has no cp314 wheel on PyPI despite cp314 being requested the day before it was cut — nothing failed, so there was nothing to notice.

Downstream effect: on Python 3.14, pip/uv fall back to the sdist, so every install compiles the Cython/C++ extensions. That needs a C++ toolchain, which slim CI images and many containers don't have — it surfaces as error: [Errno 2] No such file or directory: 'c++' rather than anything mentioning wheels.

Reproducing it

$ CIBW_BUILD='cp310-* cp311-* cp312-* cp313-* cp314-*' CIBW_SKIP='cp*-musllinux*' \
  CIBW_PLATFORM=linux CIBW_ARCHS=auto64 cibuildwheel==2.23.3 --print-build-identifiers
cp310-manylinux_...  cp311-manylinux_...  cp312-manylinux_...  cp313-manylinux_...
                                                              # cp314 absent

$ ... cibuildwheel==4.2.0 --print-build-identifiers
cp310-...  cp311-...  cp312-...  cp313-...  cp314-manylinux_...   ✅

cp314 first resolves at 3.1.4 — worth noting that 3.0.0 doesn't have it either, so a bump to 3.0 wouldn't have fixed this.

Why the manylinux pin is in the same change

A bare bump to 4.x would do something you probably don't want. cibuildwheel's default manylinux image changed from manylinux2014 to manylinux_2_28 in 3.0, which would raise the glibc floor of every published wheel from 2.17 → 2.28. Users on older distros who currently get a wheel would start building from source — a breaking change with nothing to do with Python 3.14.

Pinning the previous default keeps existing wheel tags byte-identical, so this PR only adds cp314. And nothing is lost by staying: quay.io/pypa/manylinux2014_x86_64:latest ships cp314 (/opt/python contains cp314-cp314 and cp314-cp314t).

Moving to manylinux_2_28 is a perfectly reasonable thing to want — just as its own deliberate decision. Happy to drop those two lines if you'd rather take it here.

Scope

Both release.yml and wheels_build.yml, so the pre-merge wheel build and the publishing build stay in step.

Verified by resolving your exact CIBW_* config at 4.2.0 across linux/macos/windows — no errors or deprecation warnings, and the identifier set is the five you intend. I haven't run a full build, so a maintainer eye on CIBW_BEFORE_BUILD under 4.x is worth having.

Disclosure: prepared with AI assistance (Claude Code); the reproduction commands above were run and their output is quoted verbatim.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.22%. Comparing base (4eab026) to head (2a704eb).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #597   +/-   ##
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  Coverage    98.22%   98.22%           
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  Files          182      182           
  Lines         8356     8356           
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  Hits          8208     8208           
  Misses         148      148           

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