PulsarBinderIntegrationTests config upddate

Signed-off-by: Soby Chacko <soby.chacko@broadcom.com>

Author: sobychacko

binders/pulsar-binder/spring-cloud-stream-binder-pulsar/src/test/java/org/springframework/cloud/stream/binder/pulsar/PulsarBinderIntegrationTests.java

@@ -59,6 +59,7 @@
 import org.springframework.pulsar.core.PulsarConsumerFactory;
 import org.springframework.pulsar.core.PulsarProducerFactory;
 import org.springframework.pulsar.core.SchemaResolver.SchemaResolverCustomizer;
+import org.springframework.pulsar.support.header.JsonPulsarHeaderMapper;
 import org.springframework.pulsar.support.header.PulsarHeaderMapper;
 import org.springframework.pulsar.support.header.ToStringPulsarHeaderMapper;
 
@@ -520,6 +521,13 @@ static class CustomComplexHeadersConfig {
 
 			private int msgCount = 0;
 
+			@Bean
+			public PulsarHeaderMapper pulsarHeaderMapper() {
+				return JsonPulsarHeaderMapper.builder()
+						.trustedPackages("org.springframework.cloud.stream.binder.pulsar")
+						.build();
+			}
+
 			@Bean
 			public Supplier<Message<String>> springMessageSupplier() {
 				return () -> {