AssertionError / BadCredentialsException with retrosheet.events() due to GH_TOKEN when processing local Retrosheet files

When calling pybaseball.retrosheet.events(year, type='regular') to process locally stored (but not pre-parsed by an external Chadwick install) Retrosheet event files, the function attempts to initialize PyGithub and make authenticated calls to the GitHub API. This leads to an AssertionError if os.environ['GH_TOKEN'] is not set or is empty, or a github.GithubException.BadCredentialsException: 401 if a dummy token is provided. This occurs even if the intention is to only parse local files without needing to download Chadwick or other resources from GitHub.