fix gtk version

3 jobs for master in 13 minutes and 59 seconds (queued for 1 second)
Status Job ID Name Coverage
  Babl
passed #382171
babl-git-meson

00:01:04

 
  Gegl
passed #382172
gegl-git-autotools

00:04:42

 
  Gimp
passed #382173
build-all-git

00:08:12