bump kafka to 3.9.0

Author: adwk67

docs/modules/kafka/examples/getting_started/kafka.yaml

@@ -5,7 +5,7 @@ metadata:
   name: simple-kafka
 spec:
   image:
-    productVersion: 3.7.2
+    productVersion: 3.9.0
   clusterConfig:
     tls:
       serverSecretClass: null