[gxml] CI: fix install dependencies using -y for apt

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit 9fcd4696425ce790922120ae8c97439cfd427472
Author: Daniel Espinosa <esodan gmail com>
Date:   Tue Sep 4 18:58:33 2018 -0500

    CI: fix install dependencies using -y for apt

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 480a19e..6c88abe 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -15,7 +15,7 @@ variables:
 
 before_script:
   - apt update
-  - apt-get install -y $DEPENDENCIES
+  - apt -y install $DEPENDENCIES
 
 build-gxml:
   stage: build