chore: service provider no longer has to change app type

framework/core/src/Foundation/AbstractServiceProvider.php

@@ -9,24 +9,9 @@
 
 namespace Flarum\Foundation;
 
-use Illuminate\Contracts\Container\Container;
 use Illuminate\Support\ServiceProvider;
 
 abstract class AbstractServiceProvider extends ServiceProvider
 {
-    /**
-     * @deprecated perpetually, not removed because Laravel needs it.
-     * @var Container
-     */
-    protected $app;
-
-    public function __construct(
-        protected Container $container
-    ) {
-        parent::__construct($container);
-    }
-
-    public function register()
-    {
-    }
+    //
 }