CI-unixish

updated `actions/setup-python` to `v6` #1255

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Run time

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Job	Run time
build (macos-13, clang++)	1s
build (ubuntu-24.04, clang++)	3m 17s
build (macos-15, clang++)	54s
build (ubuntu-22.04, g++)	29s
build (ubuntu-22.04, clang++)	1m 3s
build (macos-14, clang++)	42s
build (ubuntu-24.04, g++)	3m 2s
	9m 28s