chore: upgrade to L9

BREAKING CHANGE: This commit updates the Laravel framework to version 9. Additionally, it also updates outdated and abandoned dependencies in the composer.json file.

The resources/lang directory has also been moved to the repository's root directory.

app/Http/Controllers/UserController.php

@@ -74,6 +74,7 @@ class UserController extends Controller
             return view('dashboard.administration.players')
             ->with([
                 'users' => $matchingUsers,
+                'numUsers' => count(User::all()),
                 'bannedUserCount' => Ban::all()->count(),
             ]);
         } else {