Merge branch '4.3' into 4.4

* 4.3:
  [Debug] fix ClassNotFoundFatalErrorHandler
  [Routing] Fix using a custom matcher & generator dumper class
  [Dotenv] Fixed infinite loop with missing quote followed by quoted value
  [HttpClient] Added missing sprintf
  [TwigBridge] button_widget now has its title attr translated even if its label = null or false
  [PhpUnitBridge] When using phpenv + phpenv-composer plugin, composer executable is wrapped into a bash script
  [Messenger] Added check if json_encode succeeded
  [Security] Prevent canceled remember-me cookie from being accepted
  [FrameworkBundle][TranslationUpdateCommand] Do not output positive feedback on stderr
  [Security\Guard] Fix missing typehints

Author: nicolas-grekas

Response/ResponseTrait.php

@@ -353,7 +353,7 @@ public static function stream(iterable $responses, float $timeout = null): \Gene
                             }
 
                             if ('' !== $chunk && null !== $response->content && \strlen($chunk) !== fwrite($response->content, $chunk)) {
-                                $multi->handlesActivity[$j] = [null, new TransportException('Failed writing %d bytes to the response buffer.', \strlen($chunk))];
+                                $multi->handlesActivity[$j] = [null, new TransportException(sprintf('Failed writing %d bytes to the response buffer.', \strlen($chunk)))];
                                 continue;
                             }