Bump mocha from 8.4.0 to 9.0.0 (#285)

Bumps [mocha](https://github.com/mochajs/mocha) from 8.4.0 to 9.0.0.
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](mochajs/mocha@v8.4.0...v9.0.0)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

package.json

@@ -58,7 +58,7 @@
     "gulp-sass": "^4.1.0",
     "gulp-stylelint": "^13.0.0",
     "jsdom": "^16.0.1",
-    "mocha": "^8.2.0",
+    "mocha": "^9.0.0",
     "react": "^16.0.0",
     "react-dom": "^16.0.0",
     "react-test-renderer": "^17.0.2",