addresses https://php.watch/versions/8.2/dynamic-properties-deprecated

src/Service/BigQueryConnect.php

@@ -65,6 +65,13 @@ class BigQueryConnect {
    */
   protected $messenger;
 
+  /**
+   * Config factory service
+   *
+   * @var \Drupal\Core\Config\ConfigFactoryInterface
+   */
+  protected $configFactory;
+
   /**
    * Service config and DI.
    *