scheduled event `edit` uses `cover` parameter instead of `image`

[Snawe]

Summary

Discord API calls that image and not cover

What is the feature request for?

The core library

The Problem

In scheduled_events.py the edit function uses a cover parameter. However, the Discord API calls it image. In guilds.py the create_scheduled_event function also uses image.

The Ideal Solution

Always call it image.

The Current Solution

No response

Additional Context

Note: Renaming the parameter would be a breaking change.