fix: Ensure sets can be serialized

[silasary]

What type of pull request is this?

• Non-breaking code change
• Breaking code change
• Documentation change/addition
• Tests change

Description

In order to serialize sets, we either:

• need to do it in the serializer level, with a defaults= parameter when we call json.dumps
• need to convert them to something the default serializer can handle.

Because we don't control aioclient's serializer, I opted with the easier second option.

Changes

Changed the existing dict_filter_missing function to also process sets into lists.

Checklist

• I've formatted my code with Black
• I've ensured my code works on Python 3.10.x
• I've tested my code