• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
• Have you successfully run brew style with your changes locally?
• Have you successfully run brew typecheck with your changes locally?
• Have you successfully run brew tests with your changes locally?

This is really only used in Homebrew/core, so it should be safe to just
change ref here to main. Without this, dispatch-build-bottle
creates PRs that mistakenly target the master branch instead of the
main branch.