Bump eclipsecbi/fedora-gtk3-mutter in /container

Bumps eclipsecbi/fedora-gtk3-mutter from `3ea25ce` to `9d87510`.

---
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@sha256:3ea25cedec3197f4e91b7f24f84b698b09370b6569d2e69d64e204528fcc4196
+FROM eclipsecbi/fedora-gtk3-mutter:39-gtk3.24@sha256:9d87510442a28b812f036965db01187996aecc9d6cdbd781a77d7ec32cb69f7f
 
 # Back to root for install
 USER 0