Fix annotation processor warning

Author: slinkydeveloper

sdk-api-gen/src/main/java/dev/restate/sdk/gen/ServiceProcessor.java

@@ -29,7 +29,6 @@
 import javax.tools.StandardLocation;
 
 @SupportedAnnotationTypes("*")
-@SupportedSourceVersion(SourceVersion.RELEASE_17)
 public class ServiceProcessor extends AbstractProcessor {
 
   private HandlebarsTemplateEngine serviceDefinitionFactoryCodegen;
@@ -158,7 +157,12 @@ public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment
     return false;
   }
 
-  public static Path readOrCreateResource(Filer filer, String file) throws IOException {
+    @Override
+    public SourceVersion getSupportedSourceVersion() {
+        return SourceVersion.latestSupported();
+    }
+
+    public static Path readOrCreateResource(Filer filer, String file) throws IOException {
     try {
       FileObject fileObject = filer.getResource(StandardLocation.CLASS_OUTPUT, "", file);
       return new File(fileObject.toUri()).toPath();