[glib: 1/2] ci: Update all Debian CI runners to use v5 of the Dockerfile

[Emmanuele Bassi <ebassi src gnome org>]

commit b7fe4b84ee8f822c7519e972898885c7553ca4fb
Author: Philip Withnall <withnall endlessm com>
Date:   Mon Nov 25 10:51:14 2019 +0000

    ci: Update all Debian CI runners to use v5 of the Dockerfile
    
    This shouldn’t affect them (since it just adds the `clang-format-7`
    package), but it’s good to keep everything on the same version.
    
    Signed-off-by: Philip Withnall <withnall endlessm com>
    
    See: #1552

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 62ddfd5d2..01cf6acb1 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -65,7 +65,7 @@ fedora-x86_64:
       - "_coverage"
 
 debian-stable-x86_64:
-  image: registry.gitlab.gnome.org/gnome/glib/debian-stable:v4
+  image: registry.gitlab.gnome.org/gnome/glib/debian-stable:v5
   stage: build
   except:
     - tags