Both GitHubMixin and BugzillaMixin define fetch_data_from_url_with_authentication, and so we aren't making authenticated requests to GitHub in some circumstances.
<rdar://problem/91968024>
Pull request: https://github.com/WebKit/WebKit/pull/317
Committed r293025 (249764@main): <https://commits.webkit.org/249764@main> Reviewed commits have been landed. Closing PR #317 and removing active labels.