fix(lakala): Creation of dynamic property SixShop\Lakala\Service\NotifyService::$notifyApi is deprecated

src/Service/NotifyService.php

@@ -14,6 +14,7 @@ use function SixShop\Core\throw_logic_exception;
 
 class NotifyService
 {
+    private LakalaNotifyApi $notifyApi;
     public function __construct(private Config $config, private PaymentProvider $paymentProvider)
     {
         $this->notifyApi = new LakalaNotifyApi($this->config->getV3Config());