chore(deps): update google-github-actions/auth action to v2.1.6

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
google-github-actions/auth	action	patch	v2.1.5 -> v2.1.6

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Release Notes

google-github-actions/auth (google-github-actions/auth)

### [`v2.1.6`](https://redirect.github.com/google-github-actions/auth/releases/tag/v2.1.6) [Compare Source](https://redirect.github.com/google-github-actions/auth/compare/v2.1.5...v2.1.6) ##### What's Changed - Recommend `gcloud storage` over `gsutil` by [@​sethvargo](https://redirect.github.com/sethvargo) in [https://github.com/google-github-actions/auth/pull/438](https://redirect.github.com/google-github-actions/auth/pull/438) - Add missing log line by [@​sethvargo](https://redirect.github.com/sethvargo) in [https://github.com/google-github-actions/auth/pull/448](https://redirect.github.com/google-github-actions/auth/pull/448) - Release: v2.1.6 by [@​google-github-actions-bot](https://redirect.github.com/google-github-actions-bot) in [https://github.com/google-github-actions/auth/pull/449](https://redirect.github.com/google-github-actions/auth/pull/449) **Full Changelog**: https://github.com/google-github-actions/auth/compare/v2.1.5...v2.1.6

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[dpebot]

/gcbrun