Update project jszip to v2.4.0

libgrabber updated project jszip to v2.4.0.

@Stuk

### Metadata information

```json
{
  "metadata": {
    "packageManager": "github",
    "name": "jszip",
    "repo": "Stuk/jszip",
    "files": {
      "basePath": "dist/",
      "include": ["jszip.min.js"],
      "exclude": []
    },
    "path": "/home/jsdelivr/files/jszip",
    "localVersions": ["2.2.1", "2.2.2"],
    "remoteVersions": ["v1.0.0", "v1.0.1", "v2.0.0", "v2.1.0", "v2.1.1", "v2.2.0", "v2.2.1", "v2.2.2", "v2.3.0", "v2.4.0"],
    "branchVersions": []
  },
  "version": "v2.4.0",
  "updated": true,
  "updatePath": "/home/jsdelivr/files/jszip/2.4.0",
  "branch": "jszip/v2.4.0"
}
```