[gtk/ci-require-macos] Revert "ci: Allow macos to fail"

[Matthias Clasen <matthiasc src gnome org>]

commit bc80eb616d4b309a54fbef37427ccfeba1a0c6ea
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Nov 1 10:33:09 2021 -0400

    Revert "ci: Allow macos to fail"
    
    This reverts commit b7cab5c5ebd50e8102938ea87cedc48670837f4b.
    
    We welcome the macos runner back.

 .gitlab-ci.yml | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index f0b31e3feb..212c857643 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -158,7 +158,6 @@ msys2-mingw64:
     CHERE_INVOKING: "yes"
 
 macos:
-  allow_failure: true
   extends: .only-default
   only:
     - branches@GNOME/gtk