[gnome-shell] ci: Switch to mutter's v3 docker image

[Marco Trevisan <marcotrevi src gnome org>]

commit b7bf9e09e931f8dab725ef09ac42889c9804afdf
Author: Florian Müllner <fmuellner gnome org>
Date:   Tue Oct 29 02:09:46 2019 +0100

    ci: Switch to mutter's v3 docker image
    
    As we start depending on newer stuff, switch to an image that is based
    on a more recent base image to minimize the pain a bit.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/792

 .gitlab-ci.yml | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 03c7f9786b..2b5c9d656c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -14,7 +14,7 @@ variables:
         - merge_requests
 
 check_commit_log:
-    image: registry.gitlab.gnome.org/gnome/mutter/master:v2
+    image: registry.gitlab.gnome.org/gnome/mutter/master:v3
     stage: review
     variables:
         GIT_DEPTH: "100"
@@ -47,7 +47,7 @@ eslint:
         when: always
 
 build:
-    image: registry.gitlab.gnome.org/gnome/mutter/master:v2
+    image: registry.gitlab.gnome.org/gnome/mutter/master:v3
     stage: build
     before_script:
         - .gitlab-ci/checkout-mutter.sh
@@ -65,7 +65,7 @@ build:
             - build
 
 test:
-    image: registry.gitlab.gnome.org/gnome/mutter/master:v2
+    image: registry.gitlab.gnome.org/gnome/mutter/master:v3
     stage: test
     variables:
         XDG_RUNTIME_DIR: "$CI_PROJECT_DIR/runtime-dir"
@@ -81,7 +81,7 @@ test:
         when: on_failure
 
 test-pot:
-    image: registry.gitlab.gnome.org/gnome/mutter/master:v2
+    image: registry.gitlab.gnome.org/gnome/mutter/master:v3
     stage: test
     before_script:
         - ninja -C mutter/build install