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

[Javier Jardón Cabezas <jjardon src gnome org>]

commit e482d98a28860a01dbb5793ce1cbb04920f02feb
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 4f53565..2b01659 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-b696d36
 
 variables:
   # Store all the bst stuff under the "${CI_PROJECT_DIR}" directory.