Bump eclipsecbi/fedora-gtk3-mutter in /container

Bumps eclipsecbi/fedora-gtk3-mutter from 39-gtk3.24 to 40-gtk3.24.

---
updated-dependencies:
- dependency-name: eclipsecbi/fedora-gtk3-mutter
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

container/Dockerfile

@@ -1,4 +1,4 @@
-FROM eclipsecbi/fedora-gtk3-mutter:39-gtk3.24@sha256:cb500df887cc2d68188ae3b19b97fe47dd2b906624f0f5fdc38b1a2f5a03cb20
+FROM eclipsecbi/fedora-gtk3-mutter:40-gtk3.24@sha256:91dce77f3d386c8288d858f721950021b68ef9e69b318cf3b7832608e5470dab
 
 # Back to root for install
 USER 0