Bump actions/checkout from 3 to 4 #65

Job	Run time
Run checks and tests over 22.0 and ubuntu-20.04	1m 33s
Run checks and tests over 22.1 and ubuntu-20.04	1m 30s
Run checks and tests over 22.2 and ubuntu-20.04	1m 32s
Run checks and tests over 22.3 and ubuntu-20.04	1m 25s
Run checks and tests over 23.0 and ubuntu-20.04	1m 42s
Run checks and tests over 23.1 and ubuntu-20.04	29s
Run checks and tests over 23.2 and ubuntu-20.04	33s
Run checks and tests over 23.3 and ubuntu-20.04	25s
Run checks and tests over 24.0 and ubuntu-20.04	29s
Run checks and tests over 24.1 and ubuntu-20.04	31s
Run checks and tests over 24.2 and ubuntu-20.04	22s
Run checks and tests over 24.3 and ubuntu-20.04	21s
Run checks and tests over 25.0 and ubuntu-20.04	22s
Run checks and tests over 25.1 and ubuntu-20.04	26s
Run checks and tests over 25.2 and ubuntu-20.04	22s
Run checks and tests over 25.3 and ubuntu-20.04	23s
Run checks and tests over 26.0 and ubuntu-20.04	28s
Run checks and tests over 26.1 and ubuntu-20.04	27s
Run checks and tests over 26.2 and ubuntu-20.04	26s
	13m 46s

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