Bug fixes

• Linux: Fixed Ubuntu 20.04 compatibility on x86_64. This regression occurred in Zed Stable v0.153.6 and Zed Preview 0.154.0-pre and was unintentional. Glibc requirement on x86_64 linux is glibc >= 2.31 as it was prior to those releases. Impacted users will have to reinstall zed. (PR #18442).