chore: Bump zookeeper version for 25.11.0 (#785)

Author: xeniape

modules/ROOT/pages/getting-started.adoc

@@ -97,7 +97,7 @@ metadata:
   name: simple-zk
 spec:
   image:
-    productVersion: 3.9.3
+    productVersion: 3.9.4
   clusterConfig:
     tls:
       serverSecretClass: null