Update smithy-model/src/main/java/software/amazon/smithy/model/valida…

…tion/validators/IdempotencyTokenIgnoredValidator.java

Co-authored-by: Michael Dowling <[email protected]>

smithy-model/src/main/java/software/amazon/smithy/model/validation/validators/IdempotencyTokenIgnoredValidator.java

@@ -34,7 +34,7 @@
 /**
  * Emits warnings when a structure member has an idempotency token trait that will be ignored.
  */
-public class IdempotencyTokenIgnoredValidator extends AbstractValidator {
+public final class IdempotencyTokenIgnoredValidator extends AbstractValidator {
 
     @Override
     public List<ValidationEvent> validate(Model model) {