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/config/ConfigCacheFactoryInterface.php

@@ -26,7 +26,7 @@ interface ConfigCacheFactoryInterface
      * @param string   $file     The absolute cache file path
      * @param callable $callable The callable to be executed when the cache needs to be filled (i. e. is not fresh). The cache will be passed as the only parameter to this callback
      *
-     * @return ConfigCacheInterface The cache instance
+     * @return ConfigCacheInterface
      */
-    public function cache($file, $callable);
+    public function cache(string $file, callable $callable);
 }