migration symfony 5 4 (#300)

* symfony 5.4 (diff dev)

* symfony 5.4 (working)

* symfony 5.4 (update autoload)

* symfony 5.4 (remove swiftmailer mailer implementation)

* symfony 5.4 (php doc and split Global accessor class)


### Impacted packages:

composer require php:">=7.2.5 <8.0.0" symfony/console:5.4.* symfony/dotenv:5.4.* symfony/framework-bundle:5.4.* symfony/twig-bundle:5.4.* symfony/yaml:5.4.* --update-with-dependencies

composer require symfony/stopwatch:5.4.* symfony/web-profiler-bundle:5.4.* --dev --update-with-dependencies

lib/symfony/twig-bridge/TokenParser/TransDefaultDomainTokenParser.php

@@ -12,6 +12,7 @@
 namespace Symfony\Bridge\Twig\TokenParser;
 
 use Symfony\Bridge\Twig\Node\TransDefaultDomainNode;
+use Twig\Node\Node;
 use Twig\Token;
 use Twig\TokenParser\AbstractTokenParser;
 
@@ -20,12 +21,12 @@ use Twig\TokenParser\AbstractTokenParser;
  *
  * @author Fabien Potencier <fabien@symfony.com>
  */
-class TransDefaultDomainTokenParser extends AbstractTokenParser
+final class TransDefaultDomainTokenParser extends AbstractTokenParser
 {
     /**
      * {@inheritdoc}
      */
-    public function parse(Token $token)
+    public function parse(Token $token): Node
     {
         $expr = $this->parser->getExpressionParser()->parseExpression();
 
@@ -37,7 +38,7 @@ class TransDefaultDomainTokenParser extends AbstractTokenParser
     /**
      * {@inheritdoc}
      */
-    public function getTag()
+    public function getTag(): string
     {
         return 'trans_default_domain';
     }