[TOOLS] Continue raising PHPStan level to 6

src/Core/ModuleManager.php

@@ -52,11 +52,11 @@ use Symfony\Component\DependencyInjection\Reference;
 
 class ModuleManager
 {
-    protected static $loader;
+    protected static \Composer\Autoload\ClassLoader $loader;
     /**
      * @codeCoverageIgnore
      */
-    public static function setLoader($l)
+    public static function setLoader(\Composer\Autoload\ClassLoader $l)
     {
         self::$loader = $l;
     }
@@ -161,7 +161,7 @@ class ModuleManager
     /**
      * Serialize this class, for dumping into the cache
      */
-    public static function __set_state($state)
+    public static function __set_state(array $state): self
     {
         $obj          = new self();
         $obj->modules = $state['modules'];