Build(deps-dev): Bump mocha from 8.3.0 to 8.3.1 (#360)

Bumps [mocha](https://github.com/mochajs/mocha) from 8.3.0 to 8.3.1.
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](mochajs/mocha@v8.3.0...v8.3.1)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -66,7 +66,7 @@
     "gulp-sass": "^4.1.0",
     "gulp-stylus": "^2.7.0",
     "less": "^3.13.0",
-    "mocha": "^8.3.0",
+    "mocha": "^8.3.1",
     "node-sass": "^5.0.0",
     "npm-run-all": "^4.1.5",
     "postcss": "^8.2.6",