Use Fedora 30 for clazy while they fix Fedora 31
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 635e9bf..461a1b8 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -69,7 +69,7 @@
 
 build_clazy:
   stage: build
-  image: fedora
+  image: fedora:30
   before_script:
     - dnf install -y 'dnf-command(builddep)'
     - dnf builddep -y poppler