npm: bump highlight.js from 10.5.0 to 10.6.0

Bumps [highlight.js](https://github.com/highlightjs/highlight.js) from 10.5.0 to 10.6.0.
- [Release notes](https://github.com/highlightjs/highlight.js/releases)
- [Changelog](https://github.com/highlightjs/highlight.js/blob/main/CHANGES.md)
- [Commits](highlightjs/highlight.js@10.5.0...10.6.0)

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

package.json

@@ -11,7 +11,7 @@
   "dependencies": {
     "bootstrap": "^4.5.3",
     "gray-matter": "^4.0.2",
-    "highlight.js": "^10.5.0",
+    "highlight.js": "^10.6.0",
     "markdown-to-jsx": "^7.1.0",
     "markdown-toc": "^1.2.0",
     "next": "10.0.3",