[gtk] ci: Update the image to Fedora 31

[Emmanuele Bassi <ebassi src gnome org>]

commit c48fe6d7ec618488481525a7416d267ec0f0e9f9
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Fri Nov 1 12:52:19 2019 +0000

    ci: Update the image to Fedora 31
    
    Fedora 31 ships with a newer version of Pango.

 .gitlab-ci.yml        | 2 +-
 .gitlab-ci/Dockerfile | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 92054ce561..d734176cdc 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:v6
+  image: registry.gitlab.gnome.org/gnome/gtk/master:v7
   stage: build
   script:
     - bash -x ./.gitlab-ci/test-docker.sh
diff --git a/.gitlab-ci/Dockerfile b/.gitlab-ci/Dockerfile
index a9c011d456..22553c36e8 100644
--- a/.gitlab-ci/Dockerfile
+++ b/.gitlab-ci/Dockerfile
@@ -1,4 +1,4 @@
-FROM fedora:30
+FROM fedora:31
 
 RUN dnf -y install \
     hicolor-icon-theme \