Merge branch '6.3' into 6.4

* 6.3:
  [PhpUnitBridge] Kill the last concurrent process when it stales for more than 60s
  [Intl] fix test
  [Intl] Use VarExporter::export() in PhpBundleWriter
  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

Iterator/ExcludeDirectoryFilterIterator.php

@@ -59,7 +59,7 @@ public function __construct(\Iterator $iterator, array $directories)
      */
     public function accept(): bool
     {
-        if ($this->isRecursive && isset($this->excludedDirs[$this->getFilename()]) && $this->isDir()) {
+        if (isset($this->excludedDirs[$this->getFilename()]) && $this->hasChildren()) {
             return false;
         }
 

Iterator/RecursiveDirectoryIterator.php

@@ -25,7 +25,6 @@ class RecursiveDirectoryIterator extends \RecursiveDirectoryIterator
 {
     private bool $ignoreUnreadableDirs;
     private bool $ignoreFirstRewind = true;
-    private ?bool $rewindable = null;
 
     // these 3 properties take part of the performance optimization to avoid redoing the same work in all iterations
     private string $rootPath;