Update Workshop - Backend API

[Littlesk]

What?
We need a way to update a workshop. We need a way for the frontend to give the new information to the backend.

Why?
Users might have made a typo or need to change the location of their workshop. We need to provide a way for them to change this without creating a new workshop and deleting the old one.

Acceptance Criteria:

• API call that allows information to be passed and updates the workshop
• It correctly updates with new information