Log Message:
py-google-auth: updated to 2.16.0

2.16.0

Features

AwsCredentials should not call metadata server if security creds and region are \ 
retrievable through the environment variables
Wrap all python built-in exceptions into library excpetions

Bug Fixes

Allow get_project_id to take a request
Make OAUTH2.0 client resistant to string type 'expires_in' responses from \ 
non-compliant services