chore(deps): update confluentinc/cp-kafka docker tag to v7.9.4

Author: renovate[bot]

dispatch-service/stack/docker-compose.yml

@@ -65,7 +65,7 @@ services:
       - no-new-privileges:true
 
   kafka:
-    image: confluentinc/cp-kafka:7.8.3
+    image: confluentinc/cp-kafka:7.9.4@sha256:0142ea2a6606e967ac22b5d58f6ba36de3e649980e6ac723a6341fc3c0406888
     depends_on:
       zookeeper:
         condition: service_healthy