chore: use main setuptools branch (#192)
chore: use main setuptools branch (#192)

* chore: use main setuptools branch

* Update pages/developers/pep621.md
scikit-hep/scikit-hep.github.io,scikit-hep/scikit-hep.github.io,scikit-hep/scikit-hep.github.io,scikit-hep/scikit-hep.github.io