Merge branch '6.4' into 7.0

* 6.4: (43 commits)
  [AssetMapper] Fix entrypoint scripts are not preloaded
  Fix typo in method resolvePackages
  Make FormPerformanceTestCase compatible with PHPUnit 10
  Avoid calling getInvocationCount()
  [AssetMapper] Always downloading vendor files
  [Security] Fix resetting traceable listeners
  [HttpClient] Fix type error with http_version 1.1
  [DependencyInjection] Add tests for `AutowireLocator`/`AutowireIterator`
  [DependencyInjection] Add `#[AutowireIterator]` attribute and improve `#[AutowireLocator]`
  Update documentation link
  Fix typo that causes unit test to fail
  Fix CS
  [AssetMapper] Add audit command
  [Mailer] Use idn encoded address otherwise Brevo throws an error
  [Messenger] Resend failed retries back to failure transport
  [FrameworkBundle] Fix call to invalid method in NotificationAssertionsTrait
  [Validator] Add missing italian translations
  [Notifier] Fix failing testcase
  Fix order array sum normalizedData and nestedData
  Add test for 0 and '0' in PeriodicalTrigger Fix '0' case error and remove duplicate code
  ...

Author: derrabus

Definition/Builder/TreeBuilder.php

@@ -20,8 +20,8 @@
  */
 class TreeBuilder implements NodeParentInterface
 {
-    protected NodeInterface $tree;
-    protected NodeDefinition $root;
+    protected ?NodeInterface $tree = null;
+    protected ?NodeDefinition $root = null;
 
     public function __construct(string $name, string $type = 'array', NodeBuilder $builder = null)
     {
@@ -50,7 +50,7 @@ public function buildTree(): NodeInterface
     public function setPathSeparator(string $separator): void
     {
         // unset last built as changing path separator changes all nodes
-        unset($this->tree);
+        $this->tree = null;
 
         $this->root->setPathSeparator($separator);
     }