python: use the new Heroku Buildpack's S3 bucket
python: use the new Heroku Buildpack's S3 bucket

heroku-buildpack-python migrated to a new S3 bucket 9 days ago. Here are
the details: https://github.com/heroku/heroku-buildpack-python/pull/1089

tsuru/platforms,tsuru/platforms,tsuru/platforms,tsuru/platforms