Bump Gtk+ required version.

As the show_uri_on_window() method
is used since a long time, and the
Gdk.WindowState.*_TILED enum flags
since a bit less time, to 3.22.23.
1 job for master in 4 minutes and 33 seconds
Status Job ID Name Coverage
  .Pre
passed #591886
flatpak

00:04:33