Temporarily Revert "Fix pipenv install twice in CI"
Temporarily Revert "Fix pipenv install twice in CI"

This reverts commit c410fd36a66e74d9b159b98c0dc8d6cc616e5c01.

This is a temporary revert in order to release new python binaries first
and then roll this change out in a separate release. This keeps releases
smaller and better organized in case we need to roll back.

heroku/heroku-buildpack-python,AltSchool/heroku-buildpack-python,Scalingo/python-buildpack,skilljar/heroku-buildpack-python,benmurden/heroku-buildpack-python-ember,AltSchool/heroku-buildpack-python,Scalingo/python-buildpack,benmurden/heroku-buildpack-python-ember,heroku/heroku-buildpack-python