chore(deps-dev): bump vuetify from 2.6.5 to 2.6.8

Bumps [vuetify](https://github.com/vuetifyjs/vuetify/tree/HEAD/packages/vuetify) from 2.6.5 to 2.6.8.
- [Release notes](https://github.com/vuetifyjs/vuetify/releases)
- [Commits](https://github.com/vuetifyjs/vuetify/commits/v2.6.8/packages/vuetify)

---
updated-dependencies:
- dependency-name: vuetify
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]