Bump actions/download-artifact from 3 to 4.1.7 in /.github/workflows #815

Job	Run time
linux-64-py3.10	5m 44s
estimation_mode_test	16m 20s
prototype_mtc	43m 1s
develop-docbuild	0s
macOS	5m 2s
placeholder_psrc	36m 42s
win-64	10m 49s
prototype_marin	1m 37s
Standard 1-Zone Example (MTC)	4m 1s
prototype_mtc_extended	1h 18m 31s
Standard 2-Zone Example (SANDAG)	58m 33s
random_seed_generation_test	2m 35s
placeholder_sandag	1h 31m 50s
prototype_sandag_xborder	4m 23s
production_semcog	5m 4s
prototype_mwcog	43m 36s
placeholder_multiple_zone	7m 51s
	6h 55m 39s

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