chore(deps): bump undici, @sveltejs/adapter-vercel and @sveltejs/kit

Removes [undici](https://github.com/nodejs/undici). It's no longer used after updating ancestor dependencies [undici](https://github.com/nodejs/undici), [@sveltejs/adapter-vercel](https://github.com/sveltejs/kit/tree/HEAD/packages/adapter-vercel) and [@sveltejs/kit](https://github.com/sveltejs/kit/tree/HEAD/packages/kit). These dependencies need to be updated together.


Removes `undici`

Updates `@sveltejs/adapter-vercel` from 3.0.3 to 5.1.0
- [Release notes](https://github.com/sveltejs/kit/releases)
- [Changelog](https://github.com/sveltejs/kit/blob/main/packages/adapter-vercel/CHANGELOG.md)
- [Commits](https://github.com/sveltejs/kit/commits/@sveltejs/[email protected]/packages/adapter-vercel)

Updates `@sveltejs/kit` from 1.26.0 to 2.5.0
- [Release notes](https://github.com/sveltejs/kit/releases)
- [Changelog](https://github.com/sveltejs/kit/blob/main/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/adapter-vercel"
  dependency-type: direct:development
- dependency-name: "@sveltejs/kit"
  dependency-type: direct:development
...

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