Bump actions/checkout from 3 to 4 (#269) #297

Job	Run time
test (1, ubuntu-latest, x64, Interface)	11m 15s
test (1, ubuntu-latest, x64, Integrators)	21m 14s
test (1, ubuntu-latest, x64, Regression)	7m 15s
test (1, ubuntu-latest, x86, Interface)	15m 53s
test (1, ubuntu-latest, x86, Integrators)	25m 2s
test (1, ubuntu-latest, x86, Regression)	10m 45s
test (1.6, ubuntu-latest, x64, Interface)	14m 36s
test (1.6, ubuntu-latest, x64, Integrators)	20m 38s
test (1.6, ubuntu-latest, x64, Regression)	9m 56s
finish	3s
	2h 16m 37s

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