Use proxy artifacts for `v2.21.1` #6811

Job	Run time
Packaging: Config file (ubuntu-latest, linked)	1m 3s
Packaging: Config file (windows-latest, linked)	4m 1s
Packaging: Config file (macos-latest, linked)	1m 8s
Packaging: Config file (ubuntu-latest, default)	1m 13s
Packaging: Config file (ubuntu-latest, nightly-latest)	1m 23s
Packaging: Config file (windows-latest, default)	3m 51s
Packaging: Config file (windows-latest, nightly-latest)	4m 42s
Packaging: Config file (macos-latest, default)	1m 18s
Packaging: Config file (macos-latest, nightly-latest)	1m 38s
	20m 17s

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