google-cloud-sdk: Update to 477.0.0

[chax]

Summary Added gke-gcloud-auth-plugin

Release notes can be found here.

Test Plan

Run few gcs commands and check that they work:

• gsutil cp gs://cloud-sdk-release/for_packagers/linux/google-cloud-cli_477.0.0.orig_amd64.tar.gz .
• gcloud auth login
• gcloud config set project <PROJECT_ID>

Checklist

• [x] Package was built and tested against unstable