chore(deps-dev): bump hexo from 5.4.0 to 6.0.0 (#144)

Bumps [hexo](https://github.com/hexojs/hexo) from 5.4.0 to 6.0.0.
- [Release notes](https://github.com/hexojs/hexo/releases)
- [Commits](hexojs/hexo@5.4.0...6.0.0)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -34,7 +34,7 @@
     "chai": "^4.2.0",
     "eslint": "^7.0.0",
     "eslint-config-hexo": "^4.0.0",
-    "hexo": "^5.0.0",
+    "hexo": "^6.0.0",
     "hexo-front-matter": "^2.0.0",
     "mocha": "^8.0.1",
     "nyc": "^15.0.0",