Branching KDE Gear. When?

[Albert Astals Cid]

We have two options:

 * Do it before RC1
 * Do it after RC1

Doing it before RC1 has the benefit that we start testing things that may 
break because of the new branch existing (CI, translations, etc).

But since some of those will actually break we should do it relatively before 
the release that is on the 10th of January, so i'd vote this Friday the 
latest.

Doing it before the RC1 has the issue that we allow Qt6 porting up to RC1 and 
Qt6 porting is usually quite big and one would not want to have to mess with 
branches when doing big changes.

Given that we have a RC2, i'd personally vote for branching [just] after RC1.

What do you all think?

Cheers,
  Albert