Log Message:
py-google-auth: update to 2.33.0.

Features

    Implement async StaticCredentials using access tokens (#1559) (dc17dfc)
    Implement base classes for credentials and request sessions (#1551) (036dac4)

Bug Fixes

    metadata: Enhance retry logic for metadata server access in _metadata.py \ 
(#1545) (61c2432)

Documentation

    Update argument for Credentials initialization (#1557) (40b9ed9)