CI-unixish

updated `actions/setup-python` to `v6` #1257

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Run time

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Job	Run time
build (macos-15-intel, clang++)	1m 56s
build (macos-15, clang++)	39s
build (ubuntu-22.04, g++)	34s
build (macos-14, clang++)	41s
build (ubuntu-22.04, clang++)	2m 4s
build (ubuntu-24.04, clang++)	3m 19s
build (macos-26, clang++)	1m 11s
build (ubuntu-24.04, g++)	3m 0s
	13m 24s