Bump mocha from 8.3.2 to 9.0.0

Bumps [mocha](https://github.com/mochajs/mocha) from 8.3.2 to 9.0.0.
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](mochajs/mocha@v8.3.2...v9.0.0)

---
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

@@ -89,7 +89,7 @@
     "lint-staged": "^10.0.9",
     "markdown-it": "^12.0.0",
     "markdown-it-anchor": "^7.0.0",
-    "mocha": "^8.0.1",
+    "mocha": "^9.0.0",
     "ncp": "^2.0.0",
     "prettier": "^2.2.0",
     "rewire": "^5.0.0",