fix: change ckeditor5 language config propety check to handle null prototype

Author: l-lejman

packages/ckeditor5/src/integration.js

@@ -44,7 +44,7 @@ export default class CKEditor5Integration extends IntegrationModel {
     if (languageObject != null) {
       if (typeof languageObject === "object") {
         // eslint-disable-next-line no-prototype-builtins
-        if (languageObject.hasOwnProperty("ui")) {
+        if (Object.prototype.hasOwnProperty.call(languageObject, "ui")) {
           return languageObject.ui;
         }
         return languageObject;