[Docs Site] Bump the npm_and_yarn group across 1 directory with 3 updates

Bumps the npm_and_yarn group with 3 updates in the / directory: [vitest](https://github.com/vitest-dev/vitest/tree/HEAD/packages/vitest), [undici](https://github.com/nodejs/undici) and [form-data](https://github.com/form-data/form-data).


Updates `vitest` from 2.1.6 to 2.1.9
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v2.1.9/packages/vitest)

Updates `undici` from 5.28.5 to 5.29.0
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](nodejs/undici@v5.28.5...v5.29.0)

Updates `undici` from 6.21.1 to 6.21.3
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](nodejs/undici@v5.28.5...v5.29.0)

Updates `form-data` from 4.0.1 to 4.0.4
- [Release notes](https://github.com/form-data/form-data/releases)
- [Changelog](https://github.com/form-data/form-data/blob/master/CHANGELOG.md)
- [Commits](form-data/form-data@v4.0.1...v4.0.4)

---
updated-dependencies:
- dependency-name: vitest
  dependency-version: 2.1.9
  dependency-type: direct:development
  dependency-group: npm_and_yarn
- dependency-name: undici
  dependency-version: 5.29.0
  dependency-type: indirect
  dependency-group: npm_and_yarn
- dependency-name: undici
  dependency-version: 6.21.3
  dependency-type: indirect
  dependency-group: npm_and_yarn
- dependency-name: form-data
  dependency-version: 4.0.4
  dependency-type: indirect
  dependency-group: npm_and_yarn
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]