build(deps): bump actions/download-artifact from 3 to 4 #4

Job	Run time
prepare	1s
test / prepare	5m 41s
test / run (containerd, ./frontend/dockerfile, integration)	4m 38s
test / run (containerd, ./frontend/dockerfile, dockerfile)	5m 35s
test / run (containerd-rootless, ./frontend/dockerfile, integration)	4m 5s
test / run (containerd-rootless, ./frontend/dockerfile, dockerfile)	5m 22s
test / run (containerd-1.6, ./frontend/dockerfile, integration)	4m 35s
test / run (containerd-1.6, ./frontend/dockerfile, dockerfile)	5m 30s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, integration)	5m 19s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	4m 37s
test / run (oci, ./frontend/dockerfile, integration)	3m 57s
test / run (oci, ./frontend/dockerfile, dockerfile)	4m 53s
test / run (oci-rootless, ./frontend/dockerfile, integration)	4m 13s
test / run (oci-rootless, ./frontend/dockerfile, dockerfile)	4m 47s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, integration)	4m 33s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	4m 54s
image	0s
release	0s
	1h 12m 40s

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