chore(deps): update dependency google-auth to v2.16.0

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
google-auth	==2.15.0 -> ==2.16.0

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Release Notes

googleapis/google-auth-library-python

v2.16.0

Compare Source

Features

• AwsCredentials should not call metadata server if security creds and region are retrievable through the environment variables (#​1195) (5e27c8f)
• Wrap all python built-in exceptions into library excpetions (#​1191) (a83af39)

Bug Fixes

• Allow get_project_id to take a request (#​1203) (9a4d23a)
• Make OAUTH2.0 client resistant to string type 'expires_in' responses from non-compliant services (#​1208) (9fc7b1c)

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