chore: bump undici from 6.19.7 to 6.21.1 in /admin

Bumps [undici](https://github.com/nodejs/undici) from 6.19.7 to 6.21.1.
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](nodejs/undici@v6.19.7...v6.21.1)

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

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