Bump vue-styleguidist from 4.27.1 to 4.28.0

Bumps [vue-styleguidist](https://github.com/vue-styleguidist/vue-styleguidist) from 4.27.1 to 4.28.0.
- [Release notes](https://github.com/vue-styleguidist/vue-styleguidist/releases)
- [Changelog](https://github.com/vue-styleguidist/vue-styleguidist/blob/dev/CHANGELOG.md)
- [Commits](vue-styleguidist/vue-styleguidist@v4.27.1...v4.28.0)

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