Fix: Add missing CURLOPT_RETURNTRANSFER so that webhook response is not directly outputted

Author: cwdt

src/Client/CurlPicqerClient.php

@@ -33,6 +33,7 @@ private function post(string $endpoint, array $body): void
         curl_setopt($session, CURLOPT_CUSTOMREQUEST, 'POST');
         curl_setopt($session, CURLOPT_POSTFIELDS, json_encode($body));
         curl_setopt($session, CURLOPT_FAILONERROR, true);
+        curl_setopt($session, CURLOPT_RETURNTRANSFER, true);
 
         curl_exec($session);