Bump highlight.js from 9.15.6 to 10.4.1

Bumps [highlight.js](https://github.com/highlightjs/highlight.js) from 9.15.6 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@9.15.6...10.4.1)

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

Author: dependabot[bot]

package-lock.json

@@ -2,7 +2,7 @@
   "name": "markdown",
   "version": "0.4.0",
   "dependencies": {
-    "highlight.js": "^9.15.6",
+    "highlight.js": "^10.4.1",
     "markdown-it": "^8.4.2"
   },
   "devDependencies": {