Update dependency pytest to v6 [(#4390)](https://github.com/GoogleCloudPlatform/python-docs-samples/issues/4390)
Update dependency pytest to v6 [(#4390)](https://github.com/GoogleCloudPlatform/python-docs-samples/issues/4390)


GoogleCloudPlatform/python-docs-samples,GoogleCloudPlatform/python-docs-samples,GoogleCloudPlatform/python-docs-samples,GoogleCloudPlatform/python-docs-samples