[gtk/popup-shadow-width] ci: Temporarily disable macOS CI job as runner is offline

[Matthias Clasen <matthiasc src gnome org>]

commit fd83d1e5d94e96a9b6226ce7a74c3ae86739936f
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Feb 10 19:49:33 2021 -0500

    ci: Temporarily disable macOS CI job as runner is offline
    
    See https://gitlab.gnome.org/Infrastructure/GitLab/-/issues/495

 .gitlab-ci.yml | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 00624776e5..6c6d15c8a7 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -146,7 +146,9 @@ msys2-mingw64:
     MSYSTEM: "MINGW64"
     CHERE_INVOKING: "yes"
 
-macos:
+# FIXME: Temporarily disabled while the macOS runner is offline
+# See https://gitlab.gnome.org/Infrastructure/GitLab/-/issues/495
+.macos:
   extends: .only-default
   only:
     - branches@GNOME/gtk