Bump undici from 6.4.0 to 6.7.1 in /tunnel-server

Bumps [undici](https://github.com/nodejs/undici) from 6.4.0 to 6.7.1.
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](nodejs/undici@v6.4.0...v6.7.1)

---
updated-dependencies:
- dependency-name: undici
  dependency-type: direct:development
...

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

tunnel-server/yarn.lock

@@ -513,11 +513,6 @@
     ajv-formats "^2.1.1"
     fast-uri "^2.0.0"
 
-"@fastify/busboy@^2.0.0":
-  version "2.1.0"
-  resolved "https://registry.npmjs.org/@fastify/busboy/-/busboy-2.1.0.tgz#0709e9f4cb252351c609c6e6d8d6779a8d25edff"
-  integrity sha512-+KpH+QxZU7O4675t3mnkQKcZZg56u+K/Ct2K+N2AZYNVK8kyeo/bI18tI8aPm3tvNNRyTWfj6s5tnGNlcbQRsA==
-
 "@fastify/cors@^8.3.0":
   version "8.3.0"
   resolved "https://registry.yarnpkg.com/@fastify/cors/-/cors-8.3.0.tgz#f03d745731b770793a1a15344da7220ca0d19619"
@@ -3832,11 +3827,9 @@ undici-types@~5.26.4:
   integrity sha512-JlCMO+ehdEIKqlFxk6IfVoAUVmgz7cU7zD/h9XZ0qzeosSHmUJVOzSQvvYSYWXkFXC+IfLKSIffhv0sVZup6pA==
 
 undici@^6.4.0:
-  version "6.4.0"
-  resolved "https://registry.npmjs.org/undici/-/undici-6.4.0.tgz#7ca0c3f73e1034f3c79e566183b61bb55b1410ea"
-  integrity sha512-wYaKgftNqf6Je7JQ51YzkEkEevzOgM7at5JytKO7BjaURQpERW8edQSMrr2xb+Yv4U8Yg47J24+lc9+NbeXMFA==
-  dependencies:
-    "@fastify/busboy" "^2.0.0"
+  version "6.7.1"
+  resolved "https://registry.yarnpkg.com/undici/-/undici-6.7.1.tgz#3cb27222fd5d72c1b2058f4e18bf9b53dd933af8"
+  integrity sha512-+Wtb9bAQw6HYWzCnxrPTMVEV3Q1QjYanI0E4q02ehReMuquQdLTEFEYbfs7hcImVYKcQkWSwT6buEmSVIiDDtQ==
 
 universalify@^0.2.0:
   version "0.2.0"