Bump actions/checkout from 6 to 7 (#26) #19

Job	Run time
test (macos-latest, 29.4, false)	3m 22s
test (ubuntu-latest, 26.3, false)	33s
test (ubuntu-latest, 28.2, false)	35s
test (windows-latest, 28.2, false)	56s
test (windows-latest, 30.1, false)	57s
test (windows-latest, 26.3, false)	1m 44s
test (ubuntu-latest, 27.2, false)	32s
test (windows-latest, snapshot, true)	1m 15s
test (ubuntu-latest, snapshot, true)	31s
test (ubuntu-latest, 29.4, false)	42s
test (windows-latest, 29.4, false)	1m 0s
test (macos-latest, snapshot, true)	2m 52s
test (macos-latest, 30.1, false)	3m 5s
test (windows-latest, 27.2, false)	59s
test (macos-latest, 28.2, false)	2m 41s
test (ubuntu-latest, 30.1, false)	33s
	22m 17s

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