Various projects disappeared from kernel.org hosting overnight

Seems like it was a mirroring mishap, with the fix still underway (as of writing this): https://status.linuxfoundation.org/incidents/3y1k8b4ky71t

> A misconfiguration while adding the new primary mirror temporarily impacted access to the kernel archives on our mirrors. A fix has been implemented, and we are currently working to restore all content.