Bump mocha from 6.2.1 to 8.1.1

Bumps [mocha](https://github.com/mochajs/mocha) from 6.2.1 to 8.1.1.
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](mochajs/mocha@v6.2.1...v8.1.1)

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

package.json

@@ -46,7 +46,7 @@
     "cz-conventional-changelog": "3.0.2",
     "eslint": "^6.5.1",
     "feathers-nedb": "^5.0.2",
-    "mocha": "^6.2.1",
+    "mocha": "^8.1.1",
     "nedb": "^1.8.0",
     "nyc": "^14.1.1",
     "semantic-release": "^15.13.24"