fixed deprecated code in contrib module

web/modules/custom/edlp_agenda/src/Controller/AgendaController.php

@@ -14,6 +14,10 @@ use Drupal\core\render\RenderContext;
 
 class AgendaController extends ControllerBase {
 
+  private $future_nids;
+  private $future_nodes;
+  private $past_nids;
+  private $past_nodes;
 
   private function query() {
     // @see https://www.webomelette.com/query-entities-using-dates-drupal-8