Bump highlight.js from 9.12.0 to 10.4.1

Bumps [highlight.js](https://github.com/highlightjs/highlight.js) from 9.12.0 to 10.4.1.
- [Release notes](https://github.com/highlightjs/highlight.js/releases)
- [Changelog](https://github.com/highlightjs/highlight.js/blob/master/CHANGES.md)
- [Commits](highlightjs/highlight.js@9.12.0...10.4.1)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -28,7 +28,7 @@
     "chalk": "^2.4.1",
     "cheerio": "^1.0.0-rc.2",
     "fs-extra": "^6.0.0",
-    "highlight.js": "^9.12.0",
+    "highlight.js": "^10.4.1",
     "react-jsx": "^1.0.0",
     "showdown": "^1.8.6"
   }