Merge branch '5.4' into 6.2

* 5.4:
  [PhpUnitBridge] Kill the last concurrent process when it stales for more than 60s
  [Intl] fix test
  [Intl] Use VarExporter::export() in PhpBundleWriter
  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 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

Author: nicolas-grekas

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;
         }