Auto-update dependencies. [(#1980)](https://github.com/GoogleCloudPlatform/python-docs-samples/issues/1980)
Auto-update dependencies. [(#1980)](https://github.com/GoogleCloudPlatform/python-docs-samples/issues/1980)

* Auto-update dependencies.

* Update requirements.txt

* Update requirements.txt

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