Bump undici in /docs in the npm_and_yarn group across 1 directory (#606)

Bumps the npm_and_yarn group with 1 update in the /docs directory: [undici](https://github.com/nodejs/undici).


Updates `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
  dependency-group: npm_and_yarn
...

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Author: dependabot[bot]