test: improve auth test coverage

[zkoppert]

improve auth test coverage by adding invalid credentials test

Pull Request

Proposed Changes

This pull request includes a new test case in the test_auth.py file to ensure the auth_to_github function correctly raises a ValueError when provided with incorrect credentials.

Readiness Checklist

Author/Contributor

• If documentation is needed for this change, has that been included in this pull request
• run make lint and fix any issues that you have introduced
• run make test and ensure you have test coverage for the lines you are introducing
• If publishing new data to the public (scorecards, security scan results, code quality results, live dashboards, etc.), please request review from @jeffrey-luszcz

Reviewer

• Label as either fix, documentation, enhancement, infrastructure, maintenance or breaking

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