CI-unixish

updated `actions/checkout` to `v6` #1254

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Run time

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Job	Run time
build (ubuntu-24.04, g++)	3m 12s
build (ubuntu-22.04, g++)	40s
build (macos-14, clang++)	44s
build (ubuntu-22.04, clang++)	51s
build (macos-13, clang++)	1s
build (macos-15, clang++)	49s
build (ubuntu-24.04, clang++)	3m 0s
	9m 17s