Log Message:
py-google-auth: updated to 1.20.1

1.20.1

Bug Fixes

reduce refresh clock skew to 10 seconds
set Content-Type header in the request to signBlob API to avoid Invalid JSON \ 
payload error

1.20.0

Features

Add debug logging that can help with diagnosing auth lib. path
Show the transport exception that happened for GCE Metadata
packaging: add support for Python 3.8