showAssigned parameter in "list" method of Google Tasks service is not present in typescript types.

1) Is this a client library issue or a product issue?
client library

2) Did someone already solve this?
- Search the issues already opened: doesn't appear
- Search the issues on our "catch-all" repository: doesn't appear
- Search or ask on StackOverflow (engineers monitor these tags): doesn't appear

3) Do you have a support contract?
No

#### Environment details
- `googleapis` version: 140.0.1 (latest)

#### Steps to reproduce
```
import { google } from 'googleapis';
const service = google.tasks({ version: 'v1', auth });
const tasksResult = await service.tasks.list({
tasklist: tasklistId!,
showCompleted: true,
showHidden: true,
showDeleted: true,
showAssigned: true,
});
```
2. error appears: Object literal may only specify known properties, and showAssigned does not exist in type

I see it appears on the source typescript code of this repo, but not in the build typescript types

Thanks!