fix namespace and use spelling mistake

apps/backend/database/factories/UserFactory.php

@@ -1,8 +1,8 @@
 <?php
 
-namespace database\factories;
+namespace Database\Factories;
 
-use app\Models\User;
+use App\Models\User;
 use Illuminate\Database\Eloquent\Factories\Factory;
 use Illuminate\Support\Facades\Hash;
 use Illuminate\Support\Str;