Update actions/checkout in GitHub Actions to v4 #18

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Run time

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Job	Run time
clang (11)	46s
gcc (9)	38s
clang (12)	1m 20s
msvc (windows-2019)	1m 43s
gcc (10)	47s
msvc (windows-2022)	1m 25s
gcc (11)	43s
	7m 22s