Use proxy artifacts for `v2.21.1` #4745

Job	Run time
Ruby analysis (macos-latest, linked)	52s
Ruby analysis (ubuntu-latest, default)	48s
Ruby analysis (macos-latest, nightly-latest)	54s
Ruby analysis (ubuntu-latest, nightly-latest)	49s
Ruby analysis (macos-latest, default)	1m 5s
Ruby analysis (ubuntu-latest, linked)	48s
	5m 16s

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