Delete a grant for a connection

Deletes a specific permission granted on a specific connection. ### Usage notes - Retrieve the **connectionId** by calling the [/v2/connections](https://help.sigmacomputing.com/reference/list-connections) endpoint. ### Usage scenarios - **Principle of least privilege**: Reduce the permissions granted to specific users and teams on a connection to only what is needed. - **User offboarding**: Remove connection permissions granted to a user that will be deactivated.