docs/examples/docker-compose: update cobalt package version

Author: wukko

docs/examples/docker-compose.example.yml

@@ -1,11 +1,11 @@
 services:
-    cobalt-api:
-        image: ghcr.io/imputnet/cobalt:10
+    cobalt:
+        image: ghcr.io/imputnet/cobalt:11
 
         init: true
         read_only: true
         restart: unless-stopped
-        container_name: cobalt-api
+        container_name: cobalt
 
         ports:
             - 9000:9000/tcp