chore(deps): bump @tootallnate/once and pack-n-play

Removes [@tootallnate/once](https://github.com/TooTallNate/once). It's no longer used after updating ancestor dependency [pack-n-play](https://github.com/googleapis/google-cloud-node-core/tree/HEAD/dev-packages/pack-n-play). These dependencies need to be updated together.


Removes `@tootallnate/once`

Updates `pack-n-play` from 2.0.1 to 4.2.1
- [Release notes](https://github.com/googleapis/google-cloud-node-core/releases)
- [Changelog](https://github.com/googleapis/google-cloud-node-core/blob/main/dev-packages/pack-n-play/CHANGELOG.md)
- [Commits](https://github.com/googleapis/google-cloud-node-core/commits/pack-n-play-v4.2.1/dev-packages/pack-n-play)

---
updated-dependencies:
- dependency-name: "@tootallnate/once"
  dependency-version: 
  dependency-type: indirect
- dependency-name: pack-n-play
  dependency-version: 4.2.1
  dependency-type: direct:development
...

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Author: dependabot[bot]