Bump actions/checkout from 3.5.3 to 4.1.1 #207

Job	Run time
test (1.6, x64, ubuntu-latest)	2m 17s
test (1.6, x64, macOS-latest)	4m 53s
test (1.6, x64, windows-latest)	6m 28s
test (1, x64, ubuntu-latest)	2m 29s
test (1, x64, macOS-latest)	3m 0s
test (1, x64, windows-latest)	3m 3s
test (nightly, x64, ubuntu-latest)	4m 15s
test (nightly, x64, macOS-latest)	4m 13s
test (nightly, x64, windows-latest)	5m 18s
test (ubuntu-latest, 1, x86)	2m 25s
	38m 21s

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