Merge branch '7.4' into 8.0

* 7.4:
  fix package name in deprecation message
  [Intl] Fix locale validator when canonicalize is true
  Update GitHub PR template
  [FrameworkBundle] also deprecate the internal rate limiter factory alias
  also deprecate the internal rate limiter factory alias
  [FrameworkBundle] Allow using their name without added suffix when using #[Target] for custom services
  [String] Leverage grapheme_str_split()
  [Notifier] Update fake SMS transports to use contracts event dispatcher.
  [Console] Cleanup test
  [Security] Document `FirewallListenerInterface` as a firewall listener type
  [VarDumper] Remove duplicate default caster for Socket
  WS fix
  Remove unused and non-existent Factory attribute use
  Move property accessor phpdoc to interface
  fix: twigphp/Twig/issues/4647

Author: nicolas-grekas

Cloner/AbstractCloner.php

@@ -201,8 +201,6 @@ abstract class AbstractCloner implements ClonerInterface
 
         'XmlParser' => ['Symfony\Component\VarDumper\Caster\XmlResourceCaster', 'castXml'],
 
-        'Socket' => ['Symfony\Component\VarDumper\Caster\SocketCaster', 'castSocket'],
-
         'RdKafka' => ['Symfony\Component\VarDumper\Caster\RdKafkaCaster', 'castRdKafka'],
         'RdKafka\Conf' => ['Symfony\Component\VarDumper\Caster\RdKafkaCaster', 'castConf'],
         'RdKafka\KafkaConsumer' => ['Symfony\Component\VarDumper\Caster\RdKafkaCaster', 'castKafkaConsumer'],