Downgrade GCloud to 251.0.0
gsutil 4.39 is broken: https://github.com/GoogleCloudPlatform/gsutil/issues/806
Downgrade gcloud to 251.0.0 for the time being
gsutil 4.39 is broken: https://github.com/GoogleCloudPlatform/gsutil/issues/806
Downgrade gcloud to 251.0.0 for the time being