chore(python): update release.sh to use keystore#333

parthea merged 2 commits intomaingoogleapis/python-api-core:mainfrom

owl-bot-update-lock-ae600f36b6bc972b368367b6f83a1d91ec2c82a4a116b383d67d547c56fe6de3googleapis/python-api-core:owl-bot-update-lock-ae600f36b6bc972b368367b6f83a1d91ec2c82a4a116b383d67d547c56fe6de3Copy head branch name to clipboard