chg: [rocketchat] update to 3.12.0

Signed-off-by: Valentin Lab <valentin.lab@kalysto.org>

rocketchat/metadata.yml

@@ -1,7 +1,7 @@
 summary: "Rocket Chat server"
 maintainer: "Valentin Lab <valentin.lab@kalysto.org>"
-#docker-image: rocketchat/rocket.chat:3.9.1
-docker-image: docker.0k.io/rocketchat:3.9.1
+#docker-image: rocketchat/rocket.chat:3.12.0
+docker-image: docker.0k.io/rocketchat:3.12.0
 data-resources:
   - /app/uploads
 uses: