Add CI checks on free-threaded Python 3.14 #5

Job	Run time
Build source distribution	35s
Build wheels for ARM64 on Windows	9m 41s
Build ubuntu-24.04-arm (aarch64) wheels	8m 17s
Build wheels for x86_64 on macos-15-intel	14m 3s
Build wheels for AMD64 on windows-latest	11m 34s
Build ubuntu-22.04 (x86_64) wheels	6m 1s
Build wheels for arm64 on macos-14	9m 18s
Publish to PyPI	0s
Show artifacts	0s
	59m 29s

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