build: Switch gitlab CI to use a Debian buster
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 3d6dbb6..e784272 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,4 +1,4 @@
-image: debian:stretch
+image: debian:buster
test:
before_script: