Bump eclipsecbi/fedora-gtk3-mutter in /container

Bumps eclipsecbi/fedora-gtk3-mutter from `92c8ca8` to `2a6899b`.

---
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:40-gtk3.24@sha256:92c8ca8d4834eb9eb08a3e260ecad208b754f02e6e2a9131e794e294d75510ea
+FROM eclipsecbi/fedora-gtk3-mutter:40-gtk3.24@sha256:2a6899b2b9a9b14860666310f6090259bf3a5ac1bf27f24c3cd6273eb7d07113
 
 # Back to root for install
 USER 0