chore(deps): update dependency google-cloud-storage-transfer to v1.2.1 (#7561)
chore(deps): update dependency google-cloud-storage-transfer to v1.2.1 (#7561)


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