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Update actions/checkout in GitHub Actions to v4 #22

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Run time

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Job	Run time
clang (11)	1m 21s
gcc (9)	31s
msvc (windows-2019)	1m 42s
msvc (windows-2022)	1m 53s
gcc (10)	46s
gcc (11)	33s
clang (12)	36s
	7m 22s