chore(python): remove configure_previous_major_version_branches#2680

gcf-owl-bot[bot] wants to merge 1 commit intomaingoogleapis/google-api-python-client:mainfrom

owl-bot-update-lock-fbbc8db67afd8b7d71bf694c5081a32da0c528eba166fbcffb3b6e56ddf907d5googleapis/google-api-python-client:owl-bot-update-lock-fbbc8db67afd8b7d71bf694c5081a32da0c528eba166fbcffb3b6e56ddf907d5Copy head branch name to clipboard