Duplicate `github_com_user_id` tied to deleted users

I have a Coder user that I've unlinked in the past from Github and deleted. Ive recreated them later to authenticate to the same Github, but I end up running into this error:

```
Multiple Coder users found with GitHub user ID 13365989
```

Ive verified that I only have 1 account actively tied to that 1 Github user. Checking the database, it looks like deleted users still have their `github_com_user_id` set, causing the action to interpolate deleted users with active ones.

Is there any way to filter out deleted users? Or could we get that added here: https://github.com/coder/create-task-action/blob/v0.0.5/src/coder-client.ts#L96 Not totally sure if this is an issue with how we're handling these records on the DB, or if its something that could be handled via URL queries.