Remove dead CI configurations #2277

Job	Run time
build (ubuntu-latest, manylinux, manylinux)	1h 39m 22s
build (macos-15-intel, macosx, macos_x86_64, x86_64)	2h 33m 12s
Make SDist	17s
build (ubuntu-24.04-arm, manylinux, aarch64)	2h 0m 45s
build (ubuntu-latest, musllinux, musllinux)	1h 41m 43s
build (macos-14, macosx, macos_arm64, arm64)	1h 15m 20s
upload_to_test_pypy	18s
upload_to_pypi	0s
	9h 10m 57s

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