chore(deps-dev): bump hexo-util from 2.5.0 to 2.6.0

Bumps [hexo-util](https://github.com/hexojs/hexo-util) from 2.5.0 to 2.6.0.
- [Release notes](https://github.com/hexojs/hexo-util/releases)
- [Commits](hexojs/hexo-util@2.5.0...2.6.0)

---
updated-dependencies:
- dependency-name: hexo-util
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>