Merge branch '5.3' into 5.4

* 5.3:
  [Notifier] [5.3] Make sure Http TransportException is not leaking

Author: OskarStark

GatewayApiTransport.php

@@ -18,6 +18,7 @@
 use Symfony\Component\Notifier\Message\SmsMessage;
 use Symfony\Component\Notifier\Transport\AbstractTransport;
 use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
+use Symfony\Contracts\HttpClient\Exception\TransportExceptionInterface;
 use Symfony\Contracts\HttpClient\HttpClientInterface;
 
 /**
@@ -65,7 +66,12 @@ protected function doSend(MessageInterface $message): SentMessage
             ],
         ]);
 
-        $statusCode = $response->getStatusCode();
+        try {
+            $statusCode = $response->getStatusCode();
+        } catch (TransportExceptionInterface $e) {
+            throw new TransportException('Could not reach the remote GatewayApi server.', $response, 0, $e);
+        }
+
         if (200 !== $statusCode) {
             throw new TransportException(sprintf('Unable to send the SMS: error %d.', $statusCode), $response);
         }