[rhythmbox/deprecations] let's stick with f31 for now

[Jonathan Matthew <jmatthew src gnome org>]

commit 49d3fd5c02955f2a82a841a3eb9ffbb407908251
Author: Jonathan Matthew <jonathan d14n org>
Date:   Wed Jan 8 07:32:57 2020 +1000

    let's stick with f31 for now

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 57d74b20a..7f672598a 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,4 +1,4 @@
-image: fedora:latest
+image: fedora:31
 
 stages:
   - test