[gnome-build-meta] Non-fast-forward update to branch valentindavid/sourceforge-mirrors

[Valentin David <valentindavid src gnome org>]

The branch 'valentindavid/sourceforge-mirrors' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  6cd29f8... Add some sourceforge explicitly for when mirror selector do

Commits added to the branch:

  1e6c5b2... Add some sourceforge explicitly for when mirror selector do