Re-enable push support for HttpClient

Author: dunglas

src/Symfony/Component/HttpClient/CurlHttpClient.php

@@ -55,7 +55,7 @@ final class CurlHttpClient implements HttpClientInterface, LoggerAwareInterface
  *
  * @see HttpClientInterface::OPTIONS_DEFAULTS for available options
  */
- public function __construct(array $defaultOptions = [], int $maxHostConnections = 6, int $maxPendingPushes = 0)
+ public function __construct(array $defaultOptions = [], int $maxHostConnections = 6, int $maxPendingPushes = 50)
  {
  if (!\extension_loaded('curl')) {
  throw new \LogicException('You cannot use the "Symfony\Component\HttpClient\CurlHttpClient" as the "curl" extension is not installed.');