New procedure for most freeze break requests

Hi,

We're planning to turn off the release team mailing list. That means 
sending freeze break requests to the mailing list will no longer work. 
Instead, you can report issues here to request UI, feature, API, or 
hard code freeze break:

https://gitlab.gnome.org/Teams/Releng/freeze-breaks/-/issues

However, there is no change for string freeze breaks and string change 
announcements. So if you need a string freeze break, you must still 
notify [email protected]. If you're making significant UI changes 
that include string changes, that means you'll need to submit a request 
in both places. Hopefully that's not a big deal, since it should only 
happen rarely.

Reminder: we're currently in string change announcement period. String 
freeze begins this Saturday, August 22.

Michael