Event (and maybe other objects) missing 'updated_at' attribute.

[tvongaza]

Describe the bug
The web API returns an updated_at field, however it is not included in the ruby library as a defined attribute.

To Reproduce
Some steps involved to reproduce the bug and any code samples you can share.

- Call the events api via curl and see the event having an updated_at field.
- Call the same event via the ruby sdk and see the ruby object does not have an updated_at field.

Expected behavior
The ruby events object should have the same fields, such as updated_at as the web api.

SDK Version:
Latest as of March 9, 2023.

Additional context
I monkey patched the event class as follows, which gets me the updated_at field as expected.

Nylas::Event.class_eval do
  attribute :updated_at, :integer, read_only: true
end