Bump mocha from 8.3.0 to 8.3.1

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](https://github.com/mochajs/mocha/compare/v8.3.0...v8.3.1)

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

package.json

@@ -86,7 +86,7 @@
     "karma-webpack": "^4.0.0-rc.2",
     "loglevelnext": "^4.0.1",
     "marked": "2.0.1",
-    "mocha": "8.3.0",
+    "mocha": "8.3.1",
     "pixelmatch": "^5.1.0",
     "pngjs": "^6.0.0",
     "proj4": "2.7.0",