chore(deps): update actions/download-artifact action to v4.1.6 #1141

Job	Run time
core-alpine / build	7m 46s
core-ubuntu-22-lts / build	10m 56s
core-ubuntu-24-lts / build	10m 41s
standard / build	11m 25s
acceptance-alpine / test	11m 4s
install-alpine / test	22m 11s
netboot-alpine / test	9m 50s
reset-alpine / test	29m 7s
upgrade-alpine / test	1h 3m 6s
encryption-alpine (local-encryption) / test	16m 49s
encryption-alpine (remote-https-bad-cert) / test	9m 49s
encryption-alpine (remote-auto) / test	12m 17s
encryption-alpine (remote-https-pinned) / test	13m 7s
encryption-alpine (remote-static) / test	17m 42s
reset	0s
bundles	0s
install	0s
acceptance	0s
netboot	0s
upgrade	0s
upgrade-latest	0s
custom-partitioning	0s
encryption	0s
install-secureboot	0s
zfs / test	27m 19s
	4h 33m 9s

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