chore(deps): bump @vue/theme from 2.2.5 to 2.2.8

Bumps [@vue/theme](https://github.com/vuejs/theme) from 2.2.5 to 2.2.8.
- [Commits](vuejs/theme@v2.2.5...v2.2.8)

---
updated-dependencies:
- dependency-name: "@vue/theme"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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