Fixed type error

Author: limingxinleo

app/Listener/DbQueryExecutedListener.php

@@ -43,7 +43,7 @@ public function listen(): array
     /**
      * @param QueryExecuted $event
      */
-    public function process(object $event)
+    public function process(object $event): void
     {
         if ($event instanceof QueryExecuted) {
             $sql = $event->sql;

installer/resources/async_queue/QueueHandleListener.php

@@ -43,7 +43,7 @@ public function listen(): array
         ];
     }
 
-    public function process(object $event)
+    public function process(object $event): void
     {
         if ($event instanceof Event && $event->message->job()) {
             $job = $event->message->job();