Apply fixes from StyleCI

Author: StyleCIBot

tests/Integration/Notifications/DatabaseNotificationTest.php

@@ -9,7 +9,6 @@
 use Illuminate\Foundation\Testing\RefreshDatabase;
 use Illuminate\Support\Facades\Notification;
 use Illuminate\Support\Facades\Schema;
-use Illuminate\Support\Str;
 use Orchestra\Testbench\Attributes\DefineDatabase;
 use Orchestra\Testbench\Attributes\WithMigration;
 use Orchestra\Testbench\TestCase;