MAPG-199 fix issues found by PHPStan

src/Controller/GameFlowController.php

@@ -128,7 +128,7 @@ class GameFlowController
         ]);
     }
 
-    private function addNewRoundToState(&$state, Place $place, array $placesWithoutPano): void
+    private function addNewRoundToState(array &$state, Place $place, array $placesWithoutPano): void
     {
         $state['rounds'][] = [
             'placesWithoutPano' => $placesWithoutPano,