Fix and update Composer autoload

vendor/psr/container/src/ContainerInterface.php

@@ -1,7 +1,6 @@
 <?php
-/**
- * @license http://www.opensource.org/licenses/mit-license.php MIT (see the LICENSE file)
- */
+
+declare(strict_types=1);
 
 namespace Psr\Container;
 
@@ -20,7 +19,7 @@ interface ContainerInterface
      *
      * @return mixed Entry.
      */
-    public function get($id);
+    public function get(string $id);
 
     /**
      * Returns true if the container can return an entry for the given identifier.
@@ -33,5 +32,5 @@ interface ContainerInterface
      *
      * @return bool
      */
-    public function has($id);
+    public function has(string $id): bool;
 }