Bump highlight.js from 10.1.2 to 10.4.1

Bumps [highlight.js](https://github.com/highlightjs/highlight.js) from 10.1.2 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](https://github.com/highlightjs/highlight.js/compare/10.1.2...10.4.1)

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

package.json

@@ -57,7 +57,7 @@
   "dependencies": {
     "browser-request": "^0.3.3",
     "gfm.css": "^1.1.2",
-    "highlight.js": "^10.1.2",
+    "highlight.js": "^10.4.1",
     "jsrsasign": "^9.1.5",
     "katex": "^0.12.0",
     "matrix-js-sdk": "github:matrix-org/matrix-js-sdk#develop",