Merge branch '4.4' into 5.0

* 4.4:
  [Http Foundation] Fix clear cookie samesite
  [Security] Check if firewall is stateless before checking for session/previous session
  [Form] Support customized intl php.ini settings
  [Security] Remember me: allow to set the samesite cookie flag
  [Debug] fix for PHP 7.3.16+/7.4.4+
  [Validator] Backport translations
  [Mailer] Use %d instead of %s for error code in error messages
  [HttpKernel] fix locking for PHP 7.4+
  [Security] Fixed hardcoded value of SODIUM_CRYPTO_PWHASH_MEMLIMIT_INTERACTIVE
  Prevent warning in proc_open()
  [FrameworkBundle] Fix Router Cache
  Fix deprecation messages

Author: nicolas-grekas

Transport/MailgunApiTransport.php

@@ -65,10 +65,10 @@ protected function doSendApi(SentMessage $sentMessage, Email $email, Envelope $e
         $result = $response->toArray(false);
         if (200 !== $response->getStatusCode()) {
             if ('application/json' === $response->getHeaders(false)['content-type'][0]) {
-                throw new HttpTransportException(sprintf('Unable to send an email: %s (code %s).', $result['message'], $response->getStatusCode()), $response);
+                throw new HttpTransportException(sprintf('Unable to send an email: %s (code %d).', $result['message'], $response->getStatusCode()), $response);
             }
 
-            throw new HttpTransportException(sprintf('Unable to send an email: %s (code %s).', $response->getContent(false), $response->getStatusCode()), $response);
+            throw new HttpTransportException(sprintf('Unable to send an email: %s (code %d).', $response->getContent(false), $response->getStatusCode()), $response);
         }
 
         $sentMessage->setMessageId($result['id']);

Transport/MailgunHttpTransport.php

@@ -67,10 +67,10 @@ protected function doSendHttp(SentMessage $message): ResponseInterface
         $result = $response->toArray(false);
         if (200 !== $response->getStatusCode()) {
             if ('application/json' === $response->getHeaders(false)['content-type'][0]) {
-                throw new HttpTransportException(sprintf('Unable to send an email: %s (code %s).', $result['message'], $response->getStatusCode()), $response);
+                throw new HttpTransportException(sprintf('Unable to send an email: %s (code %d).', $result['message'], $response->getStatusCode()), $response);
             }
 
-            throw new HttpTransportException(sprintf('Unable to send an email: %s (code %s).', $response->getContent(false), $response->getStatusCode()), $response);
+            throw new HttpTransportException(sprintf('Unable to send an email: %s (code %d).', $response->getContent(false), $response->getStatusCode()), $response);
         }
 
         $message->setMessageId($result['id']);