chore(deps): update dependency google-auth to v2.29.0

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
google-auth	==2.28.1 -> ==2.29.0

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Release Notes

googleapis/google-auth-library-python (google-auth)

v2.29.0

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Features

• Adds support for custom suppliers in AWS and Identity Pool credentials (#​1496) (3af1768)

Bug Fixes

• Refactor tech debt in aws and identity pool credentials (#​1501) (ce435b0)

v2.28.2

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Bug Fixes

• Remove gce log for expected 404 (#​1491) (cb04e49)

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