Bump rollup and @web/dev-server in /examples/vanilla (#50)

Bumps [rollup](https://github.com/rollup/rollup) to 4.22.4 and updates ancestor dependency [@web/dev-server](https://github.com/modernweb-dev/web/tree/HEAD/packages/dev-server). These dependencies need to be updated together.


Updates `rollup` from 2.79.1 to 4.22.4
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](rollup/rollup@v2.79.1...v4.22.4)

Updates `@web/dev-server` from 0.1.35 to 0.4.6
- [Release notes](https://github.com/modernweb-dev/web/releases)
- [Changelog](https://github.com/modernweb-dev/web/blob/master/packages/dev-server/CHANGELOG.md)
- [Commits](https://github.com/modernweb-dev/web/commits/@web/[email protected]/packages/dev-server)

---
updated-dependencies:
- dependency-name: rollup
  dependency-type: indirect
- dependency-name: "@web/dev-server"
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>