Bump undici from 8.11.2 to 8.12.3 in /ui (#233)

Bumps [undici](https://github.com/nodejs/undici) from 8.11.2 to 8.12.3.
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](nodejs/undici@v8.11.2...v8.12.3)

---
updated-dependencies:
- dependency-name: undici
  dependency-version: 8.12.3
  dependency-type: indirect
...

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