chore: 🤖 use tracked properties instead of attributes

addons/api/addon/models/session.js

@@ -1,7 +1,6 @@
 import GeneratedSessionModel from '../generated/models/session';
 import { computed } from '@ember/object';
 import { equal } from '@ember/object/computed';
-import { attr } from '@ember-data/model';
 import { tracked } from '@glimmer/tracking';
 
 export default class SessionModel extends GeneratedSessionModel {
@@ -9,8 +8,8 @@ export default class SessionModel extends GeneratedSessionModel {
 
   @tracked acknowledged;
   @tracked started_desktop_client;
-  @attr('string', { readOnly: true }) proxy_address;
-  @attr('number', { readOnly: true }) proxy_port;
+  @tracked proxy_address;
+  @tracked proxy_port;
 
   @equal('status', 'active') isActive;
   @equal('status', 'pending') isPending;