As noted in an earlier message, Bugzilla's canonical repo is now on Github:
The git.mozilla.org mirror is not updating any more, so anyone pulling
from there is not getting the latest code. I'm not sure why but, as that
server is going away soon, it's not likely to get fixed.
If you have a pull of Bugzilla from git.mozilla.org and want to switch
it to being a pull from Github, take the following steps:
git remote set-url origin https://github.com/bugzilla/bugzilla.git
or, for developers who have checkin rights:
git remote set-url origin firstname.lastname@example.org:bugzilla/bugzilla.git
I believe this works whatever branch you are on.
I've filed a bug to update our documentation.