[gtk] ci: Use the v5 CI image

[Emmanuele Bassi <ebassi src gnome org>]

commit 3412d18dc22c991361b1dfacfba939e0249ebb6b
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Sat Apr 13 14:18:14 2019 +0100

    ci: Use the v5 CI image
    
    Otherwise the dependencies for the HTML report won't be available.

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 6528a6f149..cbd9e09728 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -13,7 +13,7 @@ stages:
     - subprojects/pango/
 
 fedora-x86_64:
-  image: registry.gitlab.gnome.org/gnome/gtk/master:v4
+  image: registry.gitlab.gnome.org/gnome/gtk/master:v5
   stage: build
   script:
     - bash -x ./.gitlab-ci/test-docker.sh