Summary of the new feature/enhancement

I suggest we change the name of the default branch in this repo to something other than master, due to its connotation with the history of slavery.

Proposed technical implementation details (optional)

1. Pick a less insensitive name (main/trunk/shell/where_tests_usually_break or the likes) 😅
2. Rename and push renamed branch
3. Change the default branch to the new non-master branch in the repo settings