Update dependency google-auth to v2.16.2

This MR contains the following updates:

Package	Update	Change
google-auth	patch	==2.16.1 -> ==2.16.2

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Release Notes

googleapis/google-auth-library-python

v2.16.2

Compare Source

Bug Fixes

• Call gcloud config get project to get project for user cred (#​1243) (c078a13)
• Do not use hardcoded string 'python', when you mean sys.executable. (#​1233) (91ac8e6)
• Don't retry if error or error_description is not string (#​1241) (e2d263a)
• Improve ADC related errors and warnings (#​1237) (2dfa213)

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