Bump undici and @sveltejs/kit in /webif

Bumps [undici](https://github.com/nodejs/undici) to 5.26.4 and updates ancestor dependency [@sveltejs/kit](https://github.com/sveltejs/kit/tree/HEAD/packages/kit). These dependencies need to be updated together.


Updates `undici` from 5.25.4 to 5.26.4
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](https://github.com/nodejs/undici/commits/v5.26.4)

Updates `@sveltejs/kit` from 1.25.1 to 1.26.0
- [Release notes](https://github.com/sveltejs/kit/releases)
- [Changelog](https://github.com/sveltejs/kit/blob/master/packages/kit/CHANGELOG.md)
- [Commits](https://github.com/sveltejs/kit/commits/@sveltejs/[email protected]/packages/kit)

---
updated-dependencies:
- dependency-name: undici
  dependency-type: indirect
- dependency-name: "@sveltejs/kit"
  dependency-type: direct:development
...

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

webif/package.json

@@ -14,7 +14,7 @@
   },
   "devDependencies": {
     "@sveltejs/adapter-static": "^2.0.3",
-    "@sveltejs/kit": "^1.20.4",
+    "@sveltejs/kit": "^1.26.0",
     "@typescript-eslint/eslint-plugin": "^6.0.0",
     "@typescript-eslint/parser": "^6.0.0",
     "eslint": "^8.28.0",