avoid looking up user info

[nsheaps]

Need to fork upstream action - https://github.com/dawidd6/action-homebrew-bump-formula/blob/master/main.rb#L59
This logic requires api calls to api.github.com/user, which isn't usable by github-actions. Adding new options allows for github actions to avoid this call, which is used for setting up the git config when making the commits to bump the formulae

add options:

• use_github_actions_user - uses github actions user info instead of using api to look up user info
  • see https://github.com/actions/checkout/discussions/479
• use_sender - uses sender info in github context instead of using api to look up user info