chore: add missing network.close() for KafkaContainerCluster

Author: vlsi

examples/kafka-cluster/src/test/java/com/example/kafkacluster/ApacheKafkaContainerCluster.java

@@ -100,5 +100,6 @@ public void start() {
     @Override
     public void stop() {
         this.brokers.stream().parallel().forEach(GenericContainer::stop);
+        this.network.close();
     }
 }

examples/kafka-cluster/src/test/java/com/example/kafkacluster/ConfluentKafkaContainerCluster.java

@@ -101,5 +101,6 @@ public void start() {
     @Override
     public void stop() {
         this.brokers.stream().parallel().forEach(GenericContainer::stop);
+        this.network.close();
     }
 }

examples/kafka-cluster/src/test/java/com/example/kafkacluster/KafkaContainerCluster.java

@@ -109,5 +109,6 @@ public void start() {
     @Override
     public void stop() {
         allContainers().parallel().forEach(GenericContainer::stop);
+        network.close();
     }
 }

examples/kafka-cluster/src/test/java/com/example/kafkacluster/KafkaContainerKraftCluster.java

@@ -102,5 +102,6 @@ public void start() {
     @Override
     public void stop() {
         this.brokers.stream().parallel().forEach(GenericContainer::stop);
+        this.network.close();
     }
 }