Merge branch '6.4' into 7.0

* 6.4:
  [Cache] Fix test failure related to Redis6Proxy on appveyor
  [Messenger] Fix reading pending messages with Redis
  [Serializer] Revert #54488 to fix BC Break
  [Validator] reviewed Polish translation for unit 113
  [Validator] Missing translations for Croatian (hr)
  Add hint which version of Symfony not longer require proxy manager bridge
  review and fix hungarian validation message
  Update translation
  review uk translations v2
  [Validator] Update message translations for unit 113 (TLD)
  [Intl] Remove resources data from classmap generation

Author: nicolas-grekas

composer.json

@@ -34,7 +34,8 @@
     "autoload": {
         "psr-4": { "Symfony\\Component\\Intl\\": "" },
         "exclude-from-classmap": [
-            "/Tests/"
+            "/Tests/",
+            "/Resources/data/"
         ]
     },
     "minimum-stability": "dev"