Bump undici, @sveltejs/adapter-auto 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-auto](https://github.com/sveltejs/kit/tree/HEAD/packages/adapter-auto) and [@sveltejs/kit](https://github.com/sveltejs/kit/tree/HEAD/packages/kit). These dependencies need to be updated together.


Removes `undici`

Updates `@sveltejs/adapter-auto` from 2.1.0 to 7.0.0
- [Release notes](https://github.com/sveltejs/kit/releases)
- [Changelog](https://github.com/sveltejs/kit/blob/main/packages/adapter-auto/CHANGELOG.md)
- [Commits](https://github.com/sveltejs/kit/commits/@sveltejs/adapter-auto@7.0.0/packages/adapter-auto)

Updates `@sveltejs/kit` from 1.26.0 to 2.49.4
- [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/kit@2.49.4/packages/kit)

---
updated-dependencies:
- dependency-name: undici
  dependency-version: 
  dependency-type: indirect
- dependency-name: "@sveltejs/adapter-auto"
  dependency-version: 7.0.0
  dependency-type: direct:development
- dependency-name: "@sveltejs/kit"
  dependency-version: 2.49.4
  dependency-type: direct:development
...

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Author: dependabot[bot]