fix(testutils): Drop support for Python 3.9#16948

chalmerlowe merged 5 commits intomaingoogleapis/google-cloud-python:mainfrom

feat/drop-python-3.7-3.9-google-cloud-testutilsgoogleapis/google-cloud-python:feat/drop-python-3.7-3.9-google-cloud-testutilsCopy head branch name to clipboard