`Content$update()` should use the response of the `PATCH` to replace the `Content` object's local data.

The `Content$update()` method of the `Content` class updates content on the server but does not update the local copy of the data, requiring another call to do so or simply working with an out-of-sync piece of content.

Any code calling `Content$update()` internally should be audited — if it calls `Content$get_content_remote()` after that call can be removed.