Feature request: Webhook for Vendor/Approved Purchase Order event

What version of Invoice Ninja are you running? ie v4.5 / v5
v5

What environment are you running?
Docker

Have you searched existing issues/requests?
Yes

Feature Request
Would be fantastic if we could get a Webhook event type for when a Vendor approves a Purchase Order.
Settings > Account Management > API Webhooks

![image](

Use Case
To be able to send a webhook event to a 3rd party automatation platform to perform an action when a vendor approves a purchase order.