Bump actions/checkout from 5 to 6 (#25) #17

Job	Run time
test (ubuntu-latest, 29.4, false)	30s
test (ubuntu-latest, 30.1, false)	30s
test (macos-latest, 30.1, false)	3m 15s
test (ubuntu-latest, 27.2, false)	35s
test (ubuntu-latest, 28.2, false)	35s
test (ubuntu-latest, 26.3, false)	34s
test (windows-latest, 29.4, false)	57s
test (macos-latest, 29.4, false)	2m 33s
test (macos-latest, 28.2, false)	3m 1s
test (windows-latest, 27.2, false)	1m 7s
test (windows-latest, 28.2, false)	1m 26s
test (windows-latest, 30.1, false)	1m 3s
test (macos-latest, snapshot, true)	3m 40s
test (windows-latest, snapshot, true)	23m 54s
test (ubuntu-latest, snapshot, true)	27s
test (windows-latest, 26.3, false)	1m 25s
	45m 32s

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