Bump actions/download-artifact from 3 to 4 #324

Job	Run time
test_matrix (3.0)	29s
test_matrix (3.1)	32s
test_matrix (3.2)	32s
CodeQL SAST scan / Analyze	1m 14s
Dependency Review scan / dependency-review-pr	0s
Dependency Review scan / dependency-review-push	4s
test	1s
generate_pacts	25s
account_api_pact / Verify pact tests	1m 14s
collections_pact / Verify pact tests	1m 36s
asset_manager_pact / Verify pact tests	59s
email_alert_api_pact / Verify pact tests	1m 15s
imminence_pact / Verify pact tests	1m 55s
frontend_pact / Verify pact tests	1m 25s
link_checker_api_pact / Verify pact tests	1m 1s
locations_api_pact / Verify pact tests	1m 11s
publishing_api_pact / Verify pact tests	2m 10s
publish_pacts	0s
delete_pact_artifact	3s
publish_gem	0s
	16m 6s

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