Fix KafkaProducer resources have never been released. (#4302)

Author: lightzhao

seatunnel-connectors-v2/connector-kafka/src/main/java/org/apache/seatunnel/connectors/seatunnel/kafka/sink/KafkaTransactionSender.java

@@ -122,6 +122,7 @@ public void close() {
 
     private KafkaInternalProducer<K, V> getTransactionProducer(
             Properties properties, String transactionId) {
+        close();
         Properties transactionProperties = (Properties) properties.clone();
         transactionProperties.put(ProducerConfig.TRANSACTIONAL_ID_CONFIG, transactionId);
         KafkaInternalProducer<K, V> transactionProducer =