Fix unchecked in test

Author: garyrussell

spring-kafka/src/test/java/org/springframework/kafka/annotation/EnableKafkaIntegrationTests.java

@@ -906,6 +906,7 @@ public static class Config implements KafkaListenerConfigurer {
 		@Autowired
 		private EmbeddedKafkaBroker embeddedKafka;
 
+		@SuppressWarnings("unchecked")
 		@Bean
 		public MeterRegistry meterRegistry() {
 			SimpleMeterRegistry reg = new SimpleMeterRegistry();