chore: bump up google-github-actions/auth action to v2 (#5197)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [google-github-actions/auth](https://togithub.com/google-github-actions/auth) | action | major | `v1` -> `v2` |

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### Release Notes

<details>
<summary>google-github-actions/auth (google-github-actions/auth)</summary>

### [`v2`](https://togithub.com/google-github-actions/auth/releases/tag/v2)

[Compare Source](https://togithub.com/google-github-actions/auth/compare/v1...v2)

Floating v2 alias

</details>

---

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---

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.github/actions/deploy/action.yml

@@ -26,7 +26,7 @@ runs:
         echo "GIT_SHORT_HASH=$(git rev-parse --short HEAD)" >> "$GITHUB_ENV"
     - uses: azure/setup-helm@v3
     - id: auth
-      uses: google-github-actions/auth@v1
+      uses: google-github-actions/auth@v2
       with:
         workload_identity_provider: 'projects/${{ inputs.gcp-project-number }}/locations/global/workloadIdentityPools/github-actions/providers/github-actions-helm-deploy'
         service_account: '${{ inputs.service-account }}'