build(deps-dev): bump vitepress-sidebar from 1.25.0 to 1.28.0

Bumps [vitepress-sidebar](https://github.com/jooy2/vitepress-sidebar) from 1.25.0 to 1.28.0.
- [Changelog](https://github.com/jooy2/vitepress-sidebar/blob/master/CHANGELOG.md)
- [Commits](https://github.com/jooy2/vitepress-sidebar/commits)

---
updated-dependencies:
- dependency-name: vitepress-sidebar
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]