chore(deps): bump undici from 5.5.1 to 5.8.0 in /packages/backend (#9028)

Bumps [undici](https://github.com/nodejs/undici) from 5.5.1 to 5.8.0.
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](https://github.com/nodejs/undici/compare/v5.5.1...v5.8.0

)

---
updated-dependencies:
- dependency-name: undici
  dependency-type: indirect
...

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