Bump eclipsecbi/fedora-gtk3-mutter in /container

Bumps eclipsecbi/fedora-gtk3-mutter from `6a0a7e7` to `75f8f93`.

---
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@sha256:6a0a7e7e37fb74b62bbca97b4fddd7f4a12c9f74e866fdc9fa8e8bd02c3ba358
+FROM eclipsecbi/fedora-gtk3-mutter:40-gtk3.24@sha256:75f8f93734933a28e18f7186d2b7f7a5487a6f8e42c9c3278381e3e27d592b6e
 
 # Back to root for install
 USER 0