Update dependency google-auth to v2.6.2

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
google-auth	==2.6.0 -> ==2.6.2

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Release Notes

googleapis/google-auth-library-python

### [`v2.6.2`](https://togithub.com/googleapis/google-auth-library-python/blob/HEAD/CHANGELOG.md#​262-httpsgithubcomgoogleapisgoogle-auth-library-pythoncomparev261v262-2022-03-16) [Compare Source](https://togithub.com/googleapis/google-auth-library-python/compare/v2.6.0...v2.6.2)

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