Update project jquery.formstyler to v1.5.6

libgrabber updated project jquery.formstyler to v1.5.6.

@Dimox

### Metadata information

```json
{
  "metadata": {
    "packageManager": "github",
    "name": "jquery.formstyler",
    "repo": "Dimox/jQueryFormStyler",
    "files": {
      "include": ["jquery.formstyler.min.js", "jquery.formstyler.css"],
      "exclude": []
    },
    "path": "/home/jsdelivr/files/jquery.formstyler",
    "localVersions": ["1.5.4", "1.5.5"],
    "remoteVersions": ["v1.5.5", "v1.5.6"],
    "branchVersions": []
  },
  "version": "v1.5.6",
  "updated": true,
  "updatePath": "/home/jsdelivr/files/jquery.formstyler/1.5.6",
  "branch": "jquery.formstyler/v1.5.6"
}
```