chore(deps-dev): bump mocha from 6.2.2 to 7.1.1

Bumps [mocha](https://github.com/mochajs/mocha) from 6.2.2 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/v6.2.2...v7.1.1)

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

packages/examples/package.json

@@ -68,7 +68,7 @@
     "@material-ui/lab": "^v4.0.0-alpha.14",
     "react-intl": "2.8.0",
     "prop-types": "15.7.2",
-    "mocha": "^6.1.4",
+    "mocha": "^7.1.1",
     "chai": "^4.1.2",
     "chai-string": "^1.4.0",
     "@babel/register": "^7.4.4"