8268147: need to update reference to testng module for jtreg6

Reviewed-by: dholmes, psandoz, naoto

test/jdk/java/foreign/handles/lookup_module/module-info.java

@@ -22,7 +22,7 @@
  */
 
 open module lookup_module {
-    requires testng;
+    requires org.testng;
     requires jdk.incubator.foreign;
     requires invoker_module;
     exports handle.lookup;