Bump actions/checkout from 4 to 5 #16

Job	Run time
test (ubuntu-latest, 29.4, false)	37s
test (ubuntu-latest, 30.1, false)	33s
test (ubuntu-latest, 27.2, false)	41s
test (ubuntu-latest, 28.2, false)	33s
test (ubuntu-latest, 26.3, false)	38s
test (macos-latest, 29.4, false)	2m 22s
test (macos-latest, 30.1, false)	2m 31s
test (windows-latest, 27.2, false)	2m 36s
test (macos-latest, 28.2, false)	2m 32s
test (windows-latest, 26.3, false)	1h 15m 50s
test (windows-latest, 30.1, false)	1h 11m 3s
test (windows-latest, 28.2, false)	29m 14s
test (windows-latest, 29.4, false)	40m 4s
test (macos-latest, snapshot, true)	2m 21s
test (ubuntu-latest, snapshot, true)	29s
test (windows-latest, snapshot, true)	43m 52s
	4h 35m 56s

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