Bump undici from 7.25.0 to 8.1.0

Bumps [undici](https://github.com/nodejs/undici) from 7.25.0 to 8.1.0.
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](nodejs/undici@v7.25.0...v8.1.0)

---
updated-dependencies:
- dependency-name: undici
  dependency-version: 8.1.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package.json

@@ -12,7 +12,7 @@
     "liquidjs": "^10.9.2",
     "marked": "^18.0.0",
     "npm": "^11.0.0",
-    "undici": "^7.4.0"
+    "undici": "^8.1.0"
   },
   "scripts": {
     "server": "node test-engine/server/server.mjs",