Bump mocha from 6.2.3 to 7.1.1

Bumps [mocha](https://github.com/mochajs/mocha) from 6.2.3 to 7.1.1.
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mochajs/mocha/compare/v6.2.3...v7.1.1)

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

package.json

@@ -55,7 +55,7 @@
     "express-ws": "^4.0.0",
     "glob": "^7.0.5",
     "jsdom": "^11.11.0",
-    "mocha": "^6.1.4",
+    "mocha": "^7.1.1",
     "mustache": "^3.0.1",
     "node-pty": "^0.9.0",
     "nyc": "13",