Fix type of Client::doRequest()

Author: Kocal

src/Client.php

@@ -291,7 +291,7 @@ protected function createCrawler(): PantherCrawler
         return new PantherCrawler($elements, $this->webDriver, $this->webDriver->getCurrentURL());
     }
 
-    protected function doRequest($request)
+    protected function doRequest(object $request): void
     {
         throw new LogicException('Not useful in WebDriver mode.');
     }