Ability to update schedule memo via Python SDK

Is your feature request related to a problem? Please describe.
Client,create_schedule allows a memo to be created on a schedule. Most schedule fields can be updated by calling ScheduleHandle.update, but it does not seem to allow the update of a memo with ScheduleUpdateInput/ScheduleUpdate.
Memos may contain reference information and/or metadata for the schedule that could change depending on other changes to the schedule configuration as a result of the ScheduleHandle.update call. In order to keep the memo consistent with the updated configuration, the ability to update the memo is necessary as well.

Describe the solution you'd like
Allow an updated memo object to be passed in the ScheduleHandle.update call in the ScheduleUpdate object.

Describe alternatives you've considered
There do not seem to be other ways to track metadata associated with a schedule apart from the memo field, so this seems to be the only solution.

Additional context
N/A

Start by locating the Python SDK implementation of ScheduleHandle.update and the ScheduleUpdateInput/ScheduleUpdate definitions. Check how schedule memos are created and how update requests are tested. Done means an updated memo can be passed through ScheduleHandle.update and the relevant tests cover the new behavior.