avoid deprecated Class.newInstance (sbt#192)

Author: xuwei-k

src/library/src/main/java/com/github/sbt/junit/jupiter/internal/Configuration.java

@@ -104,7 +104,8 @@ public Optional<TestExecutionListener> createRunListener(ClassLoader classLoader
         .map(
             className -> {
               try {
-                final Object listener = classLoader.loadClass(className).newInstance();
+                final Object listener =
+                    classLoader.loadClass(className).getDeclaredConstructor().newInstance();
                 return (TestExecutionListener) listener;
               } catch (Exception e) {
                 throw new RuntimeException(e);