Update project GreenSock-JS to 1.13.1

libgrabber updated project GreenSock-JS to 1.13.1.

@greensock

### Metadata information

```json
{
  "metadata": {
    "packageManager": "github",
    "name": "GreenSock-JS",
    "repo": "greensock/GreenSock-JS",
    "files": {
      "basePath": "src/minified",
      "include": ["**/*"],
      "exclude": []
    },
    "path": "/home/jsdelivr/files/gsap",
    "localVersions": ["1.11.8", "1.12.1", "1.13.0"],
    "remoteVersions": ["1.8.1", "1.8.2", "1.8.3", "1.8.4", "1.9.0", "1.9.1", "1.9.2", "1.9.3", "1.9.4", "1.9.5", "1.9.6", "1.9.7", "1.9.8", "1.10.0", "1.10.1", "1.10.2", "1.10.3", "1.11.0", "1.11.1", "1.11.2", "1.11.3", "1.11.4", "1.11.5", "1.11.6", "1.11.7", "1.11.8", "1.12.0", "1.12.1", "1.13.0", "1.13.1"],
    "branchVersions": []
  },
  "version": "1.13.1",
  "updated": true,
  "updatePath": "/home/jsdelivr/files/gsap/1.13.1",
  "branch": "GreenSock-JS/1.13.1"
}
```