[gnome-bluetooth/wip/hadess/add-abi-check] ci: Work-around another libabigail problem

[Bastien Nocera <hadess src gnome org>]

commit 8d28555520b2c0e3ebd7a8331c62449f7748b2bf
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Feb 10 13:25:54 2021 +0100

    ci: Work-around another libabigail problem

 .gitlab-ci.yml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index fb2479de..ba79ce44 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,4 +1,5 @@
-image: fedora:rawhide
+# See https://sourceware.org/bugzilla/show_bug.cgi?id=27267
+image: fedora:33
 
 variables:
   DEPENDENCIES: