[coreboot] The coreboot master branch has been deleted

[Martin Roth]

Hello All,
  It's been mentioned a few times previously that we were going to delete the master branch after switching the default branch to 'main'. This process is now completed - the master branch is gone.

One positive of this is that people can no longer push patches to the master branch in confusion, however anyone who hasn't updated scripts or git pointers in the past 6 months is now going to see failures.  This could absolutely include the coreboot project as well. We've recently found settings that were still pointing at the master branch.

If you see any oddness or issues that could be related to the master branch, please let the admins or leadership know.

Thanks much.
Martin