Provide `Authorization` header when downloading `update-job-proxy` #7867

Job	Run time
Split workflow (ubuntu-latest, nightly-latest)	1m 8s
Split workflow (macos-latest, default)	1m 15s
Split workflow (ubuntu-latest, default)	1m 21s
Split workflow (macos-latest, nightly-latest)	1m 32s
Split workflow (macos-latest, linked)	1m 41s
Split workflow (ubuntu-latest, linked)	1m 20s
	8m 17s

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