Remove typehint to preserver compatibiliy with older versions of Symfony

src/DataCollector/Delivery/ClientDataCollector.php

@@ -49,7 +49,7 @@ public function __construct($clients = [], $configurations = [])
     /**
      * {@inheritdoc}
      */
-    public function collect(Request $request, Response $response, \Throwable $exception = \null)
+    public function collect(Request $request, Response $response, $exception = \null)
     {
         $messages = [];
         foreach ($this->clients as $client) {