dependencies: bump undici from 6.2.1 to 6.9.0

Bumps [undici](https://github.com/nodejs/undici) from 6.2.1 to 6.9.0.
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](nodejs/undici@v6.2.1...v6.9.0)

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

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

package.json

@@ -37,7 +37,7 @@
     "test": "TS_NODE_TRANSPILE_ONLY=true mocha"
   },
   "dependencies": {
-    "undici": "^6.2.1"
+    "undici": "^6.9.0"
   },
   "devDependencies": {
     "@binden/commitlint-config": "^2.1.0",