chore(deps-dev): bump mocha from 8.4.0 to 9.1.2

Bumps [mocha](https://github.com/mochajs/mocha) from 8.4.0 to 9.1.2.
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](mochajs/mocha@v8.4.0...v9.1.2)

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

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

package.json

@@ -40,7 +40,7 @@
     "eslint": "^8.0.0",
     "eslint-config-hexo": "^4.1.0",
     "hexo": "^5.0.0",
-    "mocha": "^8.0.1",
+    "mocha": "^9.1.2",
     "nyc": "^15.0.0"
   },
   "engines": {