Bump mocha from 8.1.1 to 8.1.3

Bumps [mocha](https://github.com/mochajs/mocha) from 8.1.1 to 8.1.3.
- [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/v8.1.1...v8.1.3)

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

package.json

@@ -85,7 +85,7 @@
     "karma-webpack": "^4.0.0-rc.2",
     "loglevelnext": "^4.0.1",
     "marked": "1.1.1",
-    "mocha": "8.1.1",
+    "mocha": "8.1.3",
     "pixelmatch": "^5.1.0",
     "pngjs": "^5.0.0",
     "proj4": "2.6.2",