Bump actions/download-artifact from 3.0.2 to 4.1.8 #575

Job	Run time
docker-API-UI	8s
docker-API-UI	7s
docker-API-Builder	15s
docker-API-Builder	19s
docker-casestudy-storefront	12s
docker-casestudy-storefront	11s
generate-api-code	25s
generate-api-code	17s
docker-content-chaincode	38s
docker-content-chaincode	39s
docker-graphjob	12s
docker-graphjob	12s
docker-graphprocessor	12s
docker-graphprocessor	13s
docker-metadata-chaincode	30s
docker-metadata-chaincode	28s
docker-relationship-chaincode	26s
docker-relationship-chaincode	25s
build-java-api	4s
build-java-api	2s
	5m 55s

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