build(deps-dev): bump the shiki group across 1 directory with 3 updates

Bumps the shiki group with 3 updates in the / directory: [@shikijs/rehype](https://github.com/shikijs/shiki/tree/HEAD/packages/rehype), [@shikijs/transformers](https://github.com/shikijs/shiki/tree/HEAD/packages/transformers) and [shiki](https://github.com/shikijs/shiki/tree/HEAD/packages/shiki).


Updates `@shikijs/rehype` from 1.4.0 to 1.6.0
- [Release notes](https://github.com/shikijs/shiki/releases)
- [Changelog](https://github.com/shikijs/shiki/blob/main/CHANGELOG.md)
- [Commits](https://github.com/shikijs/shiki/commits/v1.6.0/packages/rehype)

Updates `@shikijs/transformers` from 1.4.0 to 1.6.0
- [Release notes](https://github.com/shikijs/shiki/releases)
- [Changelog](https://github.com/shikijs/shiki/blob/main/CHANGELOG.md)
- [Commits](https://github.com/shikijs/shiki/commits/v1.6.0/packages/transformers)

Updates `shiki` from 1.4.0 to 1.6.0
- [Release notes](https://github.com/shikijs/shiki/releases)
- [Changelog](https://github.com/shikijs/shiki/blob/main/CHANGELOG.md)
- [Commits](https://github.com/shikijs/shiki/commits/v1.6.0/packages/shiki)

---
updated-dependencies:
- dependency-name: "@shikijs/rehype"
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: shiki
- dependency-name: "@shikijs/transformers"
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: shiki
- dependency-name: shiki
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: shiki
...

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