Merge branch '4.4' into 5.1

* 4.4:
  CS fix
  [travis] use PHP 8.0 to patch return types and run deps=low
  Update sl_SI translations
  Don't trigger deprecation for deprecated aliases pointing to deprecated definitions
  [HttpFoundation] use atomic writes in MockFileSessionStorage
  [DI] fix param annotation
  [Config] Add \Symfony\Component\Config\Loader::load() return type
  Simplify PHP CS Fixer config
  Rename normalize param

Loader/LoaderInterface.php

@@ -23,6 +23,8 @@ interface LoaderInterface
      *
      * @param mixed $resource The resource
      *
+     * @return mixed
+     *
      * @throws \Exception If something went wrong
      */
     public function load($resource, string $type = null);