routeNotificationForGoogleChat doesn't pass $notification

[repat]

Hello,

we've tried to use the routeNotificationForGoogleChat() method in our notifiable class and that works, however, the $notification is not passed. Could you fix this?
We'd use this to send notifications to different webhooks, based on the FQCN, instead of using the ->to() method in every single notification class and we'd like to DRY up the code :)

Thanks!