devDependencies: bump undici from 6.7.1 to 6.12.0

Bumps [undici](https://github.com/nodejs/undici) from 6.7.1 to 6.12.0.
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](nodejs/undici@v6.7.1...v6.12.0)

---
updated-dependencies:
- dependency-name: undici
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -68,7 +68,7 @@
     "prettier": "^3.2.5",
     "ts-node": "^10.9.2",
     "typedoc": "^0.25.12",
-    "undici": "^6.7.1"
+    "undici": "^6.12.0"
   },
   "publishConfig": {
     "access": "public"