Bump actions/checkout from 4 to 5 #14

Job	Run time
test (ubuntu-latest, 26.3, false)	50s
test (ubuntu-latest, 27.2, false)	37s
test (ubuntu-latest, 29.4, false)	36s
test (macos-latest, 29.4, false)	2m 40s
test (macos-latest, 28.2, false)	2m 44s
test (ubuntu-latest, 30.1, false)	39s
test (windows-latest, 27.2, false)	41m 11s
test (ubuntu-latest, 28.2, false)	41s
test (ubuntu-latest, snapshot, true)	32s
test (macos-latest, 30.1, false)	2m 36s
test (windows-latest, 28.2, false)	33m 8s
test (windows-latest, 26.3, false)	1h 20m 47s
test (windows-latest, 29.4, false)	51m 19s
test (windows-latest, 30.1, false)	48m 2s
test (windows-latest, snapshot, true)	46m 1s
test (macos-latest, snapshot, true)	2m 30s
	5h 14m 53s

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