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Make `auth` in `GitHubApiDetails` optional #9372

Job	Run time
Ruby analysis (macos-latest, default)	1m 21s
Ruby analysis (ubuntu-latest, nightly-latest)	42s
Ruby analysis (macos-latest, linked)	1m 18s
Ruby analysis (ubuntu-latest, default)	49s
Ruby analysis (macos-latest, nightly-latest)	1m 18s
Ruby analysis (ubuntu-latest, linked)	42s
	6m 10s