macOS gcloud install fails; zlib error while decompressing data: invalid stored block lengths

[dbolduc]

https://source.cloud.google.com/results/invocations/684823bb-3a8c-41dc-9f37-4638b7980d41

gcloud fails to install. We see:

zlib.error: Error -3 while decompressing data: invalid stored block lengths
Error: Failure while executing; `/usr/bin/env PATH=/usr/local/bin:/usr/local/sbin:/usr/local/Homebrew/Library/Homebrew/shims/scm:/usr/bin:/bin:/usr/sbin:/sbin /usr/local/Caskroom/google-cloud-sdk/latest/google-cloud-sdk/install.sh --usage-reporting false --bash-completion false --path-update false --rc-path false --quiet` exited with 1.