Build: Bump undici and release-it

Bumps [undici](https://github.com/nodejs/undici) to 6.21.2 and updates ancestor dependency [release-it](https://github.com/release-it/release-it). These dependencies need to be updated together.

Closes gh-5661

Updates `undici` from 6.21.1 to 6.21.2
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](https://github.com/nodejs/undici/compare/v6.21.1...v6.21.2)

Updates `release-it` from 18.1.2 to 19.0.2
- [Release notes](https://github.com/release-it/release-it/releases)
- [Changelog](https://github.com/release-it/release-it/blob/main/CHANGELOG.md)
- [Commits](https://github.com/release-it/release-it/compare/18.1.2...19.0.2)

---
updated-dependencies:
- dependency-name: undici
  dependency-version: 6.21.2
  dependency-type: indirect
- dependency-name: release-it
  dependency-version: 19.0.2
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -131,7 +131,7 @@
     "promises-aplus-tests": "npm:@mgol/promises-aplus-tests@2.1.2-mgol.1",
     "qunit": "2.24.1",
     "raw-body": "3.0.0",
-    "release-it": "18.1.2",
+    "release-it": "19.0.2",
     "requirejs": "2.3.7",
     "rimraf": "6.0.1",
     "rollup": "4.34.8",