8231262: Suppress warnings on non-serializable instance fields in security libs serializable classes

Reviewed-by: mullan, chegar

src/java.base/share/classes/sun/security/validator/ValidatorException.java

@@ -62,6 +62,7 @@ public class ValidatorException extends CertificateException {
     public static final Object T_UNTRUSTED_CERT =
         "Untrusted certificate";
 
+    @SuppressWarnings("serial") // Not statically typed as Serializable
     private Object type;
     private X509Certificate cert;