Update project malihu-custom-scrollbar-plugin to 3.0.6

libgrabber updated project malihu-custom-scrollbar-plugin to 3.0.6.

@malihu

### Metadata information

```json
{
  "metadata": {
    "packageManager": "github",
    "name": "malihu-custom-scrollbar-plugin",
    "repo": "malihu/malihu-custom-scrollbar-plugin",
    "files": {
      "include": ["jquery.mCustomScrollbar.concat.min.js", "jquery.mCustomScrollbar.js", "jquery.mCustomScrollbar.min.css", "js/minified/jquery.mCustomScrollbar.min.js", "mCSB_buttons.png"],
      "exclude": []
    },
    "path": "/home/jsdelivr/files/jquery.mcustomscrollbar",
    "localVersions": ["2.8.1", "3.0.4"],
    "remoteVersions": ["2.8.0", "2.8.1", "2.8.2", "2.8.3", "2.8.4", "2.8.5", "2.8.6", "2.8.7", "3.0.0", "3.0.1", "3.0.2", "3.0.3", "3.0.4", "3.0.5", "3.0.6"],
    "branchVersions": ["3.0.5"]
  },
  "version": "3.0.6",
  "updated": true,
  "updatePath": "/home/jsdelivr/files/jquery.mcustomscrollbar/3.0.6",
  "branch": "malihu-custom-scrollbar-plugin/3.0.6"
}
```