It's official:
https://libreboot.org/news/codeberg.html
Per this news announcement, Libreboot's Git repositories are *now* hosted by Codeberg. You can find the repositories here:
https://codeberg.org/libreboot
The old Notabug repositories are being kept, of course, and I'll continue pushing to those aswell, but they are to be considered a backup solution.
Notabug is constantly overloaded, and runs on an older Gogs. Codeberg runs on Forgejo which is much more up to date (same codebase as Gogs, but nicer features).