shared_audits: allow GitHub's IP not permitted error

[bayandin]

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For some formulae during the homepage audit, we're getting an error:

Error: GitHub API Error: Although you appear to have the correct authorization credentials, the `<org-name>` organization has an IP allow list enabled, and your IP address is not permitted to access this resource.

Ref Homebrew/homebrew-core#140255 (comment)

This PR ignores this error in SharedAudits (while getting information about repo via API).

[bayandin]

I'm still not 100% sure I found the right place, which causes the audit failure.

Any ideas on how we can check it with real data?
(I've tried to reproduce the problem on a custom tap with GitHub runners, but it didn't fail: bayandin/homebrew-tap#24)

[MikeMcQuaid]

Looks good! One style tweak, happy to merge after this. If it doesn't work: can iterate after merge.