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`](https://togithub.com/googleapis/google-auth-library-python/blob/HEAD/CHANGELOG.md#2290-2024-03-18) [Compare Source](https://togithub.com/googleapis/google-auth-library-python/compare/v2.28.2...v2.29.0) ##### Features - Adds support for custom suppliers in AWS and Identity Pool credentials ([#​1496](https://togithub.com/googleapis/google-auth-library-python/issues/1496)) ([3af1768](https://togithub.com/googleapis/google-auth-library-python/commit/3af176879fc356f785b9f5b449ce4270f437db7e)) ##### Bug Fixes - Refactor tech debt in aws and identity pool credentials ([#​1501](https://togithub.com/googleapis/google-auth-library-python/issues/1501)) ([ce435b0](https://togithub.com/googleapis/google-auth-library-python/commit/ce435b0b13f43ef9258c8693f6c3beac06da64e2)) ### [`v2.28.2`](https://togithub.com/googleapis/google-auth-library-python/blob/HEAD/CHANGELOG.md#2282-2024-03-08) [Compare Source](https://togithub.com/googleapis/google-auth-library-python/compare/v2.28.1...v2.28.2) ##### Bug Fixes - Remove gce log for expected 404 ([#​1491](https://togithub.com/googleapis/google-auth-library-python/issues/1491)) ([cb04e49](https://togithub.com/googleapis/google-auth-library-python/commit/cb04e49efa17004bff3aaa9ed974396d10f839b5))

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