build(deps-dev): bump highlight.js from 9.15.8 to 10.4.1

Bumps [highlight.js](https://github.com/highlightjs/highlight.js) from 9.15.8 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@9.15.8...10.4.1)

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

package.json

@@ -46,7 +46,7 @@
     "eslint": "^5.16.0",
     "eslint-plugin-vue": "^5.0.0",
     "gulp": "^4.0.2",
-    "highlight.js": "^9.15.8",
+    "highlight.js": "^10.4.1",
     "karma": "^4.2.0",
     "karma-chrome-launcher": "^3.0.0",
     "karma-coverage": "^1.1.2",