Merge branch '5.4' into 6.0

* 5.4:
  Fix polyfill-php73 requirement
  [CI] Fix package-tests workflow checks for contracts
  do not call preg_match() on null
  Fix UPGRADE files for framework.messenger.reset_on_message option
  [Messenger] [DI] Add auto-registration for BatchHandlerInterface
  Remove duplicated entry in UPGRADE-6.0.md
  Handle alias in completion script

Author: fabpot

DependencyInjection/FrameworkExtension.php

@@ -101,6 +101,7 @@
 use Symfony\Component\Messenger\Bridge\Amqp\Transport\AmqpTransportFactory;
 use Symfony\Component\Messenger\Bridge\Beanstalkd\Transport\BeanstalkdTransportFactory;
 use Symfony\Component\Messenger\Bridge\Redis\Transport\RedisTransportFactory;
+use Symfony\Component\Messenger\Handler\BatchHandlerInterface;
 use Symfony\Component\Messenger\Handler\MessageHandlerInterface;
 use Symfony\Component\Messenger\MessageBus;
 use Symfony\Component\Messenger\MessageBusInterface;
@@ -569,6 +570,8 @@ public function load(array $configs, ContainerBuilder $container)
             ->addTag('validator.initializer');
         $container->registerForAutoconfiguration(MessageHandlerInterface::class)
             ->addTag('messenger.message_handler');
+        $container->registerForAutoconfiguration(BatchHandlerInterface::class)
+            ->addTag('messenger.message_handler');
         $container->registerForAutoconfiguration(TransportFactoryInterface::class)
             ->addTag('messenger.transport_factory');
         $container->registerForAutoconfiguration(MimeTypeGuesserInterface::class)