refactor: used object.hasown instead of object.hasownproperty in generator.js (#1291)

Co-authored-by: Lukasz Gornicki <lpgornicki@gmail.com>

Author: rishabhr4

apps/generator/lib/generator.js

@@ -759,7 +759,7 @@ class Generator {
     // Check if the filename dictates it should be separated
     let wasSeparated = false;
     for (const prop in fileNamesForSeparation) {
-      if (Object.prototype.hasOwnProperty.call(fileNamesForSeparation, prop) && stats.name.includes(`$$${prop}$$`)) {
+      if (Object.hasOwn(fileNamesForSeparation, prop) && stats.name.includes(`$$${prop}$$`)) {
         await this.generateSeparateFiles(asyncapiDocument, fileNamesForSeparation[prop], prop, stats.name, root);
         const templateFilePath = path.relative(this.templateContentDir, path.resolve(root, stats.name));
         fs.unlink(path.resolve(this.targetDir, templateFilePath), next);