ci: Switch from ubuntu-latest to namespace (2) (#36702)

In response to ongoing [github actions
incident](https://www.githubstatus.com/incidents/c7kq3ctclddp)

Supercedes: https://github.com/zed-industries/zed/pull/36698

Release Notes:

- N/A
f2899bf34bPeter Tripp committed on 8/21/2025, 5:21:37 PM· committed by GitHubparent1b2ceae
6 files changedLine totals unavailable