Provide `Authorization` header when downloading `update-job-proxy` #5806

Job	Run time
Ruby analysis (ubuntu-latest, linked)	46s
Ruby analysis (macos-latest, nightly-latest)	58s
Ruby analysis (macos-latest, linked)	1m 16s
Ruby analysis (ubuntu-latest, default)	56s
Ruby analysis (macos-latest, default)	1m 14s
Ruby analysis (ubuntu-latest, nightly-latest)	51s
	6m 1s

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