Merge branch '5.4' into 6.0

* 5.4:
  [Dotenv] Decouple DotenvDumpCommand from FrameworkBundle
  [Dotenv] Reimplementing symfony/flex' dump-env as a Symfony command
  [PHPUnitBridge] Fix skipping triggering file override on 5.3
  Do not override correct triggering file for return type deprecations
  [HttpClient] accept headers when CURLE_RECV_ERROR is received before the content
  Use PHPUnit 9.5 on PHP 8.1
  [Serializer] Attributes that extends the serializer`s annotations do not ignore by the serialization process

Author: nicolas-grekas

Response/CurlResponse.php

@@ -315,6 +315,10 @@ private static function perform(ClientState $multi, array &$responses = null): v
                     }
                 }
 
+                if (\CURLE_RECV_ERROR === $result && 'H' === $waitFor[0] && 400 <= ($responses[(int) $ch]->info['http_code'] ?? 0)) {
+                    $multi->handlesActivity[$id][] = new FirstChunk();
+                }
+
                 $multi->handlesActivity[$id][] = null;
                 $multi->handlesActivity[$id][] = \in_array($result, [\CURLE_OK, \CURLE_TOO_MANY_REDIRECTS], true) || '_0' === $waitFor || curl_getinfo($ch, \CURLINFO_SIZE_DOWNLOAD) === curl_getinfo($ch, \CURLINFO_CONTENT_LENGTH_DOWNLOAD) ? null : new TransportException(ucfirst(curl_error($ch) ?: curl_strerror($result)).sprintf(' for "%s".', curl_getinfo($ch, \CURLINFO_EFFECTIVE_URL)));
             }