chore(deps): update dependency google-auth to v1.19.0 [(#4293)](https://github.com/GoogleCloudPlatform/python-docs-samples/issues/4293)
chore(deps): update dependency google-auth to v1.19.0 [(#4293)](https://github.com/GoogleCloudPlatform/python-docs-samples/issues/4293)


googleapis/python-language,googleapis/python-language