Bump actions/checkout from 5 to 6 (#21) #71

Job	Run time
test (ubuntu-latest, 28.2, false)	33s
test (ubuntu-latest, 29.4, false)	37s
test (windows-latest, 27.2, false)	51s
test (macos-latest, 28.2, false)	1m 1s
test (macos-latest, 30.2, false)	1m 2s
test (ubuntu-latest, 27.2, false)	32s
test (ubuntu-latest, 30.2, false)	39s
test (macos-latest, 29.4, false)	1m 1s
test (windows-latest, 29.4, false)	52s
test (ubuntu-latest, snapshot, true)	32s
test (windows-latest, snapshot, true)	50s
test (windows-latest, 30.2, false)	53s
test (windows-latest, 28.2, false)	51s
test (macos-latest, snapshot, true)	1m 1s
	11m 15s

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