chore(deps): update dependency google-cloud-bigtable to v1.6.1 (#5021)
chore(deps): update dependency google-cloud-bigtable to v1.6.1 (#5021)


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