Remove ConfirmObject import (#10634)

Author: AhmedAlaa4611

notifications.md

@@ -1360,7 +1360,6 @@ If a notification supports being sent as a Slack message, you should define a `t
 ```php
 use Illuminate\Notifications\Slack\BlockKit\Blocks\ContextBlock;
 use Illuminate\Notifications\Slack\BlockKit\Blocks\SectionBlock;
-use Illuminate\Notifications\Slack\BlockKit\Composites\ConfirmObject;
 use Illuminate\Notifications\Slack\SlackMessage;
 
 /**