Update auth.md

[joellord]

Added a note about Github authentication with basic-auth. Users need to use a personal access token instead of the cleartext password.

Changes

Added a side note about using personal access token instead of password as documented here: https://docs.github.com/en/rest/overview/other-authentication-methods#basic-authentication

/kind documentation

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[linux-foundation-easycla]

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• ✅ Joel Lord (aacc45c)

[tekton-robot]

Hi @joellord. Thanks for your PR.

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[ghost]

/ok-to-test

[pritidesai]

Welcome to the community and thank you @joellord for the contributions 🙏 🎉

/lgtm