Bump actions/checkout from 3 to 4 #7219

Job	Run time
Build SU2 (BaseMPI)	13m 47s
Build SU2 (tsan) (BaseOMP-tsan)	13m 21s
Build SU2 (ReverseMPI)	15m 37s
Build SU2 (tsan) (ReverseOMP-tsan)	29m 15s
Build SU2 (ForwardMPI)	11m 35s
Build SU2 (BaseNoMPI)	8m 33s
Build SU2 (ReverseNoMPI)	12m 39s
Build SU2 (ForwardNoMPI)	10m 6s
Build SU2 (BaseOMP)	8m 4s
Build SU2 (ReverseOMP)	16m 11s
Build SU2 (ForwardOMP)	10m 35s
Unit Tests (test_driver)	1m 4s
Regression Tests (vandv.py)	3m 20s
Unit Tests (test_driver_AD)	54s
Regression Tests (tutorials.py)	4m 19s
Unit Tests (test_driver_DD)	53s
Regression Tests (parallel_regression.py)	13m 41s
Regression Tests (parallel_regression_AD.py)	7m 29s
Regression Tests (serial_regression.py)	15m 28s
Regression Tests (serial_regression_AD.py)	5m 2s
Regression Tests (hybrid_regression.py)	10m 42s
Regression Tests (hybrid_regression_AD.py)	3m 28s
Thread Sanitizer Tests (hybrid_regression.py)	25m 44s
Thread Sanitizer Tests (hybrid_regression_AD.py)	9m 58s
	4h 11m 45s

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