chore(deps-dev): bump mocha from 5.2.0 to 8.2.1

Bumps [mocha](https://github.com/mochajs/mocha) from 5.2.0 to 8.2.1.
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](mochajs/mocha@v5.2.0...v8.2.1)

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

package.json

@@ -20,7 +20,7 @@
     "eslint": "^7.15.0",
     "eslint-config-oclif": "^3.1.0",
     "eslint-config-oclif-typescript": "^0.2.0",
-    "mocha": "^5",
+    "mocha": "^8",
     "nyc": "^15",
     "ts-node": "^9",
     "typescript": "3.8.3"