chore: CI: bump actions/download-artifact from 5 to 6 #45800

Job	Run time
configure	7s
build / Linux Lake	5m 37s
build-secondary / Linux release	37m 56s
build-secondary / macOS aarch64	37m 26s
Build matrix complete	3s
release-nightly	0s
release	0s
	1h 21m 9s

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