build(deps-dev): bump @sveltejs/adapter-vercel from 3.0.3 to 4.0.2

Bumps [@sveltejs/adapter-vercel](https://github.com/sveltejs/kit/tree/HEAD/packages/adapter-vercel) from 3.0.3 to 4.0.2.
- [Release notes](https://github.com/sveltejs/kit/releases)
- [Changelog](https://github.com/sveltejs/kit/blob/master/packages/adapter-vercel/CHANGELOG.md)
- [Commits](https://github.com/sveltejs/kit/commits/@sveltejs/[email protected]/packages/adapter-vercel)

---
updated-dependencies:
- dependency-name: "@sveltejs/adapter-vercel"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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