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

Resources/config/notifier_transports.xml

@@ -47,7 +47,8 @@
         </service>
 
         <service id="notifier.transport_factory.null" class="Symfony\Component\Notifier\Transport\NullTransportFactory" parent="notifier.transport_factory.abstract">
-            <tag name="notifier.transport_factory" />
+            <tag name="chatter.transport_factory" />
+            <tag name="texter.transport_factory" />
         </service>
     </services>
 </container>