Bump google-github-actions/auth from 2.1.5 to 2.1.6 (#81)

Bumps [google-github-actions/auth](https://github.com/google-github-actions/auth) from 2.1.5 to 2.1.6.
- [Release notes](https://github.com/google-github-actions/auth/releases)
- [Changelog](https://github.com/google-github-actions/auth/blob/main/CHANGELOG.md)
- [Commits](google-github-actions/auth@v2.1.5...v2.1.6)

---
updated-dependencies:
- dependency-name: google-github-actions/auth
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/remove_retractions.yml

@@ -13,7 +13,7 @@ jobs:
       - uses: actions/checkout@v4
       - id: 'auth'
         name: 'Authenticate to Google Cloud'
-        uses: 'google-github-actions/auth@v2.1.5'
+        uses: 'google-github-actions/auth@v2.1.6'
         with:
           credentials_json: '${{ secrets.GOOGLE_CREDENTIALS }}'
       - uses: actions/setup-python@v5