Fix serial warning in starter and example archetype

Author: Subramanya-Veeregowda

sdks/java/maven-archetypes/starter/src/main/resources/archetype-resources/src/main/java/StarterPipeline.java

@@ -51,15 +51,20 @@ public static void main(String[] args) {
         PipelineOptionsFactory.fromArgs(args).withValidation().create());
 
     p.apply(Create.of("Hello", "World"))
-    .apply(MapElements.via(new SimpleFunction<String, String>() {
+    .apply(MapElements.via(
+      new   @SuppressWarnings("serial") 
+    SimpleFunction<String, String>() {
       @Override
       public String apply(String input) {
         return input.toUpperCase();
       }
     }))
-    .apply(ParDo.of(new DoFn<String, Void>() {
+    .apply(ParDo.of(
+       new @SuppressWarnings("serial") 
+    DoFn<String, Void>() {
       @ProcessElement
-      public void processElement(ProcessContext c)  {
+      public void 
+    processElement(ProcessContext c)  {
         LOG.info(c.element());
       }
     }));