chore(python): remove configure_previous_major_version_branches#3830

quirogas merged 3 commits intomaingoogleapis/google-api-nodejs-client:mainfrom

owl-bot-update-lock-bb3dc6c75c5f3e1a8928474f2dc8d9bbfa7b809045515764b9ff48c070cf2321googleapis/google-api-nodejs-client:owl-bot-update-lock-bb3dc6c75c5f3e1a8928474f2dc8d9bbfa7b809045515764b9ff48c070cf2321Copy head branch name to clipboard