Bump highlight.js from 9.18.1 to 10.4.1

Bumps [highlight.js](https://github.com/highlightjs/highlight.js) from 9.18.1 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@9.18.1...10.4.1)

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

Author: dependabot[bot]

package-lock.json

@@ -52,7 +52,7 @@
     "handlebars": "^4.7.7",
     "hapi": "^8.4.0",
     "he": "^1.2.0",
-    "highlight.js": "^9.18.1",
+    "highlight.js": "^10.4.1",
     "marked": "^0.8.2",
     "modernizr": "^3.11.8",
     "normalize.css": "^8.0.1",