gdb-8.3-branch now open again (was: "gdb-8.3 branch FROZEN")

[Joel Brobecker]

Hey everyone,

I have the tarballs, so the branch is now open again. Just a quick
reminder that, since we're now past the first major release, any change
on the gdb-8.3-release branch should now have a corresponding
GDB PR number as well.

Thanks!
-- 
Joel