Build(deps-dev): Bump mocha from 7.1.2 to 8.4.0

Bumps [mocha](https://github.com/mochajs/mocha) from 7.1.2 to 8.4.0.
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](mochajs/mocha@v7.1.2...v8.4.0)

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

Author: dependabot[bot]

package.json

@@ -31,7 +31,7 @@
     "eslint": "6.8.0",
     "eslint-config-airbnb-base": "14.1.0",
     "eslint-plugin-import": "2.20.1",
-    "mocha": "7.1.2"
+    "mocha": "8.4.0"
   },
   "scripts": {
     "lint": "eslint *.js format/*.js ",