Suppress rawtypes warning

See gh-25531

Author: dreis2211

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/kafka/KafkaPropertiesTests.java

@@ -33,6 +33,7 @@
  */
 class KafkaPropertiesTests {
 
+	@SuppressWarnings("rawtypes")
 	@Test
 	void isolationLevelEnumConsistentWithKafkaVersion() {
 		org.apache.kafka.common.IsolationLevel[] original = org.apache.kafka.common.IsolationLevel.values();