Merge branch '5.0'

* 5.0: (28 commits)
  [DoctrineBridge] Use new Types::* constants and support new json type
  Fix bad merge in README of Nexmo Notifier bridge
  [Debug][ErrorHandler] improved deprecation notices for methods new args and return type
  [BrowserKit] Nested file array prevents uploading file
  [ExpressionLanguage] Fixed collisions of character operators with object properties
  remove usage of already deleted Symfony\Component\EventDispatcher\Event
  [Notifier] Add correct tags for NullTransportFactory
  [Validator] Remove specific check for Valid targets
  [PhpUnitBridge] Use trait instead of extending deprecated class
  Fix versioned namespace clears
  fix remember me
  Use strict assertion in asset tests
  [DoctrineBridge][DoctrineExtractor] Fix indexBy with custom and some core types
  Do not rely on the current locale when dumping a Graphviz object
  fix typo
  [Ldap] force default network timeout
  [Config] don't throw on missing excluded paths
  Docs: Typo, grammar
  [Validator] Add the missing translations for the Polish ("pl") locale
  [PhpUnitBridge] Add compatibility to PHPUnit 9 #35662
  ...

Author: nicolas-grekas

DependencyInjection/RegisterListenersPass.php

@@ -16,7 +16,6 @@
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
 use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Component\EventDispatcher\Event as LegacyEvent;
 use Symfony\Component\EventDispatcher\EventDispatcher;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 use Symfony\Contracts\EventDispatcher\Event;
@@ -141,7 +140,6 @@ private function getEventFromTypeDeclaration(ContainerBuilder $container, string
             || !($type = $m->getParameters()[0]->getType())
             || $type->isBuiltin()
             || Event::class === ($name = $type->getName())
-            || LegacyEvent::class === $name
         ) {
             throw new InvalidArgumentException(sprintf('Service "%s" must define the "event" attribute on "%s" tags.', $id, $this->listenerTag));
         }