Update shopify app to new API version - how?

Hello,

We received the below notice back in January that one of our apps for our store have made deprecated API calls (see image below) and to update the API version. I have gone to the app and checked that the Webhook version is up to date (2024-01). However, today we received another email telling us the same thing that the same app has made deprecated API calls and to update.

Is there something else somewhere that I need to update as well as the Webhook version on the app? I have read through a number of resources on what to do when this warning shows up, but they make little sense to me.

Apparently there is an API health report I can access to check the status of my app but I cannot for the life of me work out how to get access to it.

Any help would appreciated, thank you.