Merge branch '4.3' into 4.4

* 4.3:
  [Intl] Update the ICU data to 65.1 (4.3 branch)
  Replace deprecated calls in tests
  [Intl] Update the ICU data to 65.1
  Delete 5_Security_issue.md
  [DI] Whitelist validator.auto_mapper in UnusedTagsPass
  [HttpClient] Fixed #33832 NO_PROXY option ignored in NativeHttpClient::request() method
  [Cache] give 100ms before starting the expiration countdown
  [Cache] fix logger usage in CacheTrait::doGet()
  [VarDumper] fix dumping uninitialized SplFileInfo
  Added missing translations.
  Fixed invalid changelog 4.0.0 for VarDumper
  Fixed invalid VarDumper upgrade doc.
  [HttpFoundation] Check if data passed to SessionBagProxy::initialize is an array
  Don't let falsey usernames slip through

DependencyInjection/Compiler/UnusedTagsPass.php

@@ -65,6 +65,7 @@ class UnusedTagsPass implements CompilerPassInterface
         'twig.loader',
         'validator.constraint_validator',
         'validator.initializer',
+        'validator.auto_mapper',
     ];
 
     public function process(ContainerBuilder $container)