Bump actions/setup-python from 5 to 6 #510

Job	Run time
build (ubuntu-latest, 28.2, false)	48s
build (ubuntu-latest, 29.4, false)	47s
build (macos-latest, 29.4, false)	4m 14s
build (macos-latest, snapshot, true)	3m 38s
build (ubuntu-latest, 27.2, false)	47s
build (ubuntu-latest, 30.1, false)	45s
build (macos-latest, 30.1, false)	3m 58s
build (ubuntu-latest, snapshot, true)	33s
build (windows-latest, 29.4, false)	1h 12m 48s
build (windows-latest, 28.2, false)	37m 0s
build (windows-latest, snapshot, true)	51m 22s
build (windows-latest, 27.2, false)	1h 26m 3s
build (windows-latest, 30.1, false)	1h 39m 53s
build (macos-latest, 28.2, false)	4m 28s
	6h 7m 4s

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