[REF] hr: adapt code after jQuery update

Part of task 1896658

Co-authored-by: Aaron Bohy <aab@odoo.com>
Co-authored-by: Christophe Matthieu <chm@odoo.com>
Co-authored-by: Mathieu Duckerts-Antoine <dam@odoo.com>
Co-authored-by: David Monjoie <dmo@odoo.com>
Co-authored-by: Martin Geubelle <mge@odoo.com>
Co-authored-by: svs-odoo <svs@odoo.com>
Co-authored-by: Vincent Schippefilt <vsc@odoo.com>

addons/hr/static/src/js/chat.js

@@ -54,7 +54,7 @@ odoo.define('hr.employee_chat', function (require) {
                     dmChat = self.call('mail_service', 'getChannel', dmChatId);
                     dmChat.detach();
                 });
-                $.when(def);
+                Promise.resolve(def);
             }
         },
     });