Update project jquery.knob to 1.2.9

libgrabber updated project jquery.knob to 1.2.9.

@aterrien

### Metadata information

```json
{
  "metadata": {
    "packageManager": "github",
    "name": "jquery.knob",
    "repo": "aterrien/jQuery-Knob",
    "files": {
      "basePath": "dist/",
      "include": ["*.js"],
      "exclude": []
    },
    "path": "/home/jsdelivr/files/jquery.knob",
    "localVersions": ["1.2.2"],
    "remoteVersions": ["1.2.0", "1.2.1", "1.2.2", "1.2.3", "1.2.8", "1.2.9"],
    "branchVersions": []
  },
  "version": "1.2.9",
  "updated": true,
  "updatePath": "/home/jsdelivr/files/jquery.knob/1.2.9",
  "branch": "jquery.knob/1.2.9"
}
```