Bump upload/download artifact to v4 #3161

Job	Run time
cleanup	4s
changed-multicluster	18s
changed-policy	17s
changed-viz	14s
tag	2s
build-core (controller)	2m 14s
build-ext (jaeger-webhook)	2m 15s
build-core (policy-controller)	2m 32s
build-ext (metrics-api)	2m 10s
build-core (proxy)	2m 7s
build-ext (tap)	2m 10s
build-cli	2m 20s
build-ext (web)	2m 32s
test-core	0s
test-ext	0s
test-viz	0s
test-policy	0s
test-multicluster	0s
	19m 15s

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