Bump undici and release-it

Bumps [undici](https://github.com/nodejs/undici) and [release-it](https://github.com/release-it/release-it). These dependencies needed to be updated together.

Updates `undici` from 6.21.0 to 6.21.1
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](nodejs/undici@v6.21.0...v6.21.1)

Updates `release-it` from 18.1.1 to 18.1.2
- [Release notes](https://github.com/release-it/release-it/releases)
- [Changelog](https://github.com/release-it/release-it/blob/main/CHANGELOG.md)
- [Commits](release-it/release-it@18.1.1...18.1.2)

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

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

Author: dependabot[bot]