Bump google-github-actions/auth from 2.1.7 to 2.1.8 (#1644)

Bumps [google-github-actions/auth](https://github.com/google-github-actions/auth) from 2.1.7 to 2.1.8.
- [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@v2.1.7...v2.1.8)

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

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

Author: dependabot[bot]

.github/workflows/functional_test_v2.yaml

@@ -262,7 +262,7 @@ jobs:
         with:
           go-version: ${{ env.GO_VERSION }}
           cache-dependency-path: '**/go.sum'
-      - uses: 'google-github-actions/[email protected].7'
+      - uses: 'google-github-actions/[email protected].8'
         with:
           project_id: ${{ secrets.GKE_PROJECT }}
           credentials_json: ${{ secrets.GKE_SA_KEY }}
@@ -316,7 +316,7 @@ jobs:
         with:
           go-version: ${{ env.GO_VERSION }}
           cache-dependency-path: '**/go.sum'
-      - uses: 'google-github-actions/[email protected].7'
+      - uses: 'google-github-actions/[email protected].8'
         with:
           project_id: ${{ secrets.GKE_PROJECT }}
           credentials_json: ${{ secrets.GKE_SA_KEY }}