Remove relying on cglib proxy on the target class

spring-pulsar/src/main/java/org/springframework/pulsar/core/CachingPulsarProducerFactory.java

@@ -119,7 +119,6 @@ public class CachingPulsarProducerFactory<T> extends DefaultPulsarProducerFactor
 	@SuppressWarnings("unchecked")
 	private Producer<T> wrapProducerWithCloseCallback(Producer<T> producer, Consumer<Producer<T>> closeCallback) {
 		ProxyFactory factory = new ProxyFactory(producer);
-		factory.setProxyTargetClass(true);
 		factory.addAdvice(new MethodInterceptor() {
 			@Nullable
 			@Override