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

Inflector/EnglishInflector.php

@@ -253,6 +253,9 @@ final class EnglishInflector implements InflectorInterface
         // seasons (season), treasons (treason), poisons (poison), lessons (lesson)
         ['nos', 3, true, true, 'sons'],
 
+        // icons (icon)
+        ['noc', 3, true, true, 'cons'],
+
         // bacteria (bacterium), criteria (criterion), phenomena (phenomenon)
         ['no', 2, true, true, 'a'],
 

Tests/Inflector/EnglishInflectorTest.php

@@ -295,6 +295,7 @@ public static function pluralizeProvider()
             ['tree', 'trees'],
             ['waltz', 'waltzes'],
             ['wife', 'wives'],
+            ['icon', 'icons'],
 
             // test casing: if the first letter was uppercase, it should remain so
             ['Man', 'Men'],