Remove accidental usage of Type.getTypeName() which is a Java 8 API

Closes gh-6325

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/ConfigurationPropertiesReportEndpoint.java

@@ -308,8 +308,8 @@ public class ConfigurationPropertiesReportEndpoint
 		}
 
 		private boolean isReadable(BeanDescription beanDesc, BeanPropertyWriter writer) {
-			String parentType = beanDesc.getType().getRawClass().getName();
-			String type = writer.getType().getTypeName();
+			Class<?> parentType = beanDesc.getType().getRawClass();
+			Class<?> type = writer.getType().getRawClass();
 			AnnotatedMethod setter = findSetter(beanDesc, writer);
 			// If there's a setter, we assume it's OK to report on the value,
 			// similarly, if there's no setter but the package names match, we assume