Fixed bug that allowed private issues and pull request titles to be shown in search results

GitHub Security was notified about an issue where private issue and pull request titles would be displayed in search results. Our Security team investigated potential instances and determined that this only occurred when the author of the commit was authorized to view the issue or pull request and the commit was titled as a link to the private issue or pull request. Additionally, this only happened while using the new code search (beta). This issue was introduced when the new code search (beta) launched and was fixed on January 17, 2023. As this issue has been addressed, there is no further action that is required by any user.