fix: require python 3.7+#468

parthea merged 6 commits intomaingoogleapis/python-bigquery-sqlalchemy:mainfrom

owl-bot-update-lock-e7bb19d47c13839fe8c147e50e02e8b6cf5da8edd1af8b82208cd6f66cc2829cgoogleapis/python-bigquery-sqlalchemy:owl-bot-update-lock-e7bb19d47c13839fe8c147e50e02e8b6cf5da8edd1af8b82208cd6f66cc2829cCopy head branch name to clipboard