[librsvg] Fix typo.

[Jordan Petridis <jpetridis src gnome org>]

commit 92ab60ab5de78e15639f8c8d527e84509b603177
Author: Jordan Petridis <jordanpetridis protonmail com>
Date:   Sun Mar 4 12:29:24 2018 +0200

    Fix typo.

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index b839aef7..6a833e10 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -161,7 +161,7 @@ opensuse:tumbleweed_release:
     - web
 
 debian:testing_release:
-  image: $DEBIAN_TESTING
+  image: $AMD64_DEBIAN_TESTING
   stage: cross_distro_amd64
   variables:
     LIBRSVG_DEBUG: "no"