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/framework-bundle/Command/CachePoolPruneCommand.php

@@ -25,13 +25,14 @@ use Symfony\Component\Console\Style\SymfonyStyle;
 final class CachePoolPruneCommand extends Command
 {
     protected static $defaultName = 'cache:pool:prune';
+    protected static $defaultDescription = 'Prune cache pools';
 
     private $pools;
 
     /**
-     * @param iterable|PruneableInterface[] $pools
+     * @param iterable<mixed, PruneableInterface> $pools
      */
-    public function __construct($pools)
+    public function __construct(iterable $pools)
     {
         parent::__construct();
 
@@ -44,7 +45,7 @@ final class CachePoolPruneCommand extends Command
     protected function configure()
     {
         $this
-            ->setDescription('Prunes cache pools')
+            ->setDescription(self::$defaultDescription)
             ->setHelp(<<<'EOF'
 The <info>%command.name%</info> command deletes all expired items from all pruneable pools.
 
@@ -57,7 +58,7 @@ EOF
     /**
      * {@inheritdoc}
      */
-    protected function execute(InputInterface $input, OutputInterface $output)
+    protected function execute(InputInterface $input, OutputInterface $output): int
     {
         $io = new SymfonyStyle($input, $output);
 
@@ -67,5 +68,7 @@ EOF
         }
 
         $io->success('Successfully pruned cache pool(s).');
+
+        return 0;
     }
 }