build(deps): bump undici from 5.28.3 to 6.6.1

Bumps [undici](https://github.com/nodejs/undici) from 5.28.3 to 6.6.1.
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](nodejs/undici@v5.28.3...v6.6.1)

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

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

package.json

@@ -30,7 +30,7 @@
   "dependencies": {
     "fastify-plugin": "^4.5.1",
     "telegraf": "^4.14.0",
-    "undici": "^5.25.4"
+    "undici": "^6.6.1"
   },
   "devDependencies": {
     "fastify": "^4.23.2",