Bump actions/download-artifact from 3 to 4.1.7 in /.github/workflows #420

Job	Run time
Ubuntu 20.04 (clang++, error_code)	38m 33s
Ubuntu 20.04 (clang++, status_code)	39m 18s
Ubuntu 20.04 (g++, error_code)	39m 9s
Ubuntu 20.04 (g++, status_code)	41m 23s
Ubuntu 20.04 (libc++, error_code)	20m 5s
Ubuntu 20.04 (libc++, status_code)	21m 17s
Ubuntu 20.04 (arm-linux-gnueabihf-g++, error_code)	11m 41s
Ubuntu 20.04 (arm-linux-gnueabihf-g++, status_code)	11m 9s
Publish Unit Tests Results	6s
	3h 42m 41s

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