Merge branch '6.4' into 7.0

* 6.4:
  [PhpUnitBridge] Kill the last concurrent process when it stales for more than 60s
  [Intl] fix test
  [Intl] Use VarExporter::export() in PhpBundleWriter
  [Console] The application also catch `\Throwable` exceptions
  FrameworkBundle] Fix tests
  [Mailer] Fix Brevo transport factory registration
  Simplify tests
  [Notifier] Fix Esendex messages serialization
  Use triggering class to generate baseline for deprecation messages from DebugClassLoader
  [Security] Fix false-string handling in RememberMeAuthenticator
  [CssSelector] Tests on Xpath translator will always pass
  [Serializer] Fix Normalizer not utilizing converted name for index variadic param
  [DepdencyInjection] Fix costly logic when checking errored definitions
  Fix merge
  fix children cond
  [DoctrineBridge] Load refreshed user proxy
  [DependencyInjection] Don't ignore attributes on the actual decorator
  [FrameworkBundle] Prevent `cache:clear` to lose files on subsequent runs

Author: nicolas-grekas

Transport.php

@@ -14,6 +14,7 @@
 use Psr\EventDispatcher\EventDispatcherInterface;
 use Psr\Log\LoggerInterface;
 use Symfony\Component\Mailer\Bridge\Amazon\Transport\SesTransportFactory;
+use Symfony\Component\Mailer\Bridge\Brevo\Transport\BrevoTransportFactory;
 use Symfony\Component\Mailer\Bridge\Google\Transport\GmailTransportFactory;
 use Symfony\Component\Mailer\Bridge\Infobip\Transport\InfobipTransportFactory;
 use Symfony\Component\Mailer\Bridge\Mailchimp\Transport\MandrillTransportFactory;
@@ -43,6 +44,7 @@
 final class Transport
 {
     private const FACTORY_CLASSES = [
+        BrevoTransportFactory::class,
         GmailTransportFactory::class,
         InfobipTransportFactory::class,
         MailerSendTransportFactory::class,