💡 [REQUEST] - Fix warnings in `cloudrun` job in release workflow

### Summary

The latest `cloudrun` job in the `deploy` workflow for release `2.3.4` reported 3 warnings that should be fixed before they turn into errors in future releases.

https://github.com/google/slo-generator/actions/runs/4281247944

### Basic Example

- Node.js 12 actions are deprecated. Please update the following actions to use Node.js 16: tomchv/wait-my-workflow@v1.1.0. For more information see: https://github.blog/changelog/2022-09-22-github-actions-all-actions-will-begin-running-on-node16-instead-of-node12/.
- The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/
- "service_account_key" has been deprecated. Please switch to using google-github-actions/auth which supports both Workload Identity Federation and Service Account Key JSON authentication. For more details, see https://github.com/google-github-actions/setup-gcloud#authorization

### Screenshots

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### Drawbacks

None identified.

### Unresolved questions

_No response_

### Code of Conduct

- [X] I agree to follow this project's Code of Conduct