Merge branch '6.4' into 7.0

* 6.4:
  [Translation] Improve tests coverage
  [Routing] Add redirection.io as sponsor of versions 6.4/7.0/7.1
  don't check parameter values if they are not set
  [HttpClient] Add Innovative Web AG (i-web) as sponsor of version 6.4/7.0
  [Serializer] Fix normalization relying on allowed attributes only
  Minor @var doc update
  [Translation] Remove `@internal` from abstract testcases
  [VarExporter] Work around php/php-src#12695 for lazy objects, fixing nullsafe-related behavior
  [Validator] Add missing translations for Bulgarian #51931
  [VarExporter] Fix serializing objects that implement __sleep() and that are made lazy
  fix typo
  Document BC break with $secret parameter introduction
  Bump Symfony version to 6.4.0
  Update VERSION for 6.4.0-RC2
  Update CHANGELOG for 6.4.0-RC2
  [String] Fix Inflector for 'icon'
  [Validator] Made tests forward-compatible with ICU 72.1

Author: nicolas-grekas

ImportMap/ImportMapAuditor.php

@@ -35,7 +35,7 @@ public function audit(): array
     {
         $entries = $this->configReader->getEntries();
 
-        /** @var array<string, array<string, ImportMapPackageAudit>> $installed */
+        /** @var array<string, ImportMapPackageAudit> $packageAudits */
         $packageAudits = [];
 
         /** @var array<string, list<string>> $installed */