[Security] Bump highlight.js from 9.14.2 to 10.4.1

Bumps [highlight.js](https://github.com/highlightjs/highlight.js) from 9.14.2 to 10.4.1. **This update includes security fixes.**
- [Release notes](https://github.com/highlightjs/highlight.js/releases)
- [Changelog](https://github.com/highlightjs/highlight.js/blob/master/CHANGES.md)
- [Commits](https://github.com/highlightjs/highlight.js/compare/9.14.2...10.4.1)

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

package.json

@@ -57,7 +57,7 @@
     "enzyme": "^3.9.0",
     "enzyme-adapter-react-16": "^1.9.1",
     "express": "^4.16.4",
-    "highlight.js": "^9.14.2",
+    "highlight.js": "^10.4.1",
     "immer": "^1.12.1",
     "marked": "^0.6.1",
     "office-ui-fabric-react": "^6.144.0",