GitLab Rest API not[author_id] does not accept multiple values - it is defined as *[]int inside project list options

The GitLab REST API's Project Issues endpoint (/projects/:id/issues) does not support passing multiple values for the author_id parameter when filtering issues. This contradicts to the current ListProjectIssuesOptions struct definition. This struct defines the AuthorID as *int, which is correct, while the NotAuthorID is defined as *[]int, which is incorrect.

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