[folks] (3 commits) Non-fast-forward update to branch wip/ricotz/vala

[Niels De Graef <nielsdg src gnome org>]

The branch 'wip/ricotz/vala' 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:

  9c0d3c4... tests: Drop custom binding and use E.SourceRegistry constru

Commits added to the branch:

  2827fde... eds: Add nullability to error contacts_complete_cb (*)
  1853567... meson: Use python.dependency() correctly (*)
  4092dd1... tests: Drop custom binding and use E.SourceRegistry constru

(*) This commit already existed in another branch; no separate mail sent