Bump vitepress-plugin-auto-sidebar from 1.3.5 to 1.4.0

Bumps [vitepress-plugin-auto-sidebar](https://github.com/JonathanSchndr/vitepress-plugin-auto-sidebar) from 1.3.5 to 1.4.0.
- [Release notes](https://github.com/JonathanSchndr/vitepress-plugin-auto-sidebar/releases)
- [Changelog](https://github.com/JonathanSchndr/vitepress-plugin-auto-sidebar/blob/main/CHANGELOG.md)
- [Commits](JonathanSchndr/vitepress-plugin-auto-sidebar@v1.3.5...v1.4.0)

---
updated-dependencies:
- dependency-name: vitepress-plugin-auto-sidebar
  dependency-version: 1.4.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]