refine ut

Author: shalk

instrumentation/jaxrs-client/jaxrs-client-2.0-testing/src/test/java/io/opentelemetry/javaagent/instrumentation/jaxrsclient/JaxMultithreadedClientTest.java

@@ -44,7 +44,7 @@ static void setUp() {
   }
 
   @AfterAll
-  static void cleanupSpec() {
+  static void cleanUp() {
     server.stop();
   }