[gnome-shell] ci: Update mutter image

[Marge Bot <marge-bot src gnome org>]

commit 23bd0686e7d990c05a98dccd22e17892ec1f833f
Author: Florian Müllner <fmuellner gnome org>
Date:   Sat Jul 9 00:05:03 2022 +0200

    ci: Update mutter image
    
    This pulls in an up-to-date gjs, which will allow us to bump the
    version requirement.
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2371>

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 2884ebf013..2ac1d6b047 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -13,7 +13,7 @@ stages:
   - deploy
 
 default:
-  image: registry.gitlab.gnome.org/gnome/mutter/fedora/35:x86_64-2022-07-11.0
+  image: registry.gitlab.gnome.org/gnome/mutter/fedora/35:x86_64-2022-07-21.0
   # Cancel jobs if newer commits are pushed to the branch
   interruptible: true
   # Auto-retry jobs in case of infra failures