[gnome-build-meta] .gitlab-ci.yml: Update docker image with updated buildstream

[Javier Jardón Cabezas <jjardon src gnome org>]

commit c533578b85a3a6ee57fc29bbe1df584ee9b2297f
Author: Javier Jardón <jjardon gnome org>
Date:   Sat Feb 24 19:18:52 2018 +0000

    .gitlab-ci.yml: Update docker image with updated buildstream

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index b28f52f..51ba2fd 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,4 +1,4 @@
-image: buildstream/buildstream-fedora:master-47-e8de57f
+image: buildstream/buildstream-fedora:master-51-9632eaf
 
 variables:
   # Store all the bst stuff under the "${CI_PROJECT_DIR}" directory.