Adapt to breaking change in Framework's RouterFunctions.Visitor

See gh-23774

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/web/mappings/reactive/DispatcherHandlersMappingDescriptionProvider.java

@@ -182,6 +182,12 @@ public class DispatcherHandlersMappingDescriptionProvider implements MappingDesc
 		public void resources(Function<ServerRequest, Mono<Resource>> lookupFunction) {
 		}
 
+		@Override
+		public void attributes(Map<String, Object> attributes) {
+			// TODO Auto-generated method stub
+			throw new UnsupportedOperationException("Auto-generated method stub");
+		}
+
 		@Override
 		public void unknown(RouterFunction<?> routerFunction) {
 		}