Download weigths for RandLANet S3DIS from model-zoo -> awaiting response... 403 Forbidden

### Checklist

- [X] I have searched for [similar issues](https://github.com/isl-org/Open3D-ML/issues).
- [X] I have tested with the [latest development wheel](http://www.open3d.org/docs/latest/getting_started.html#development-version-pip).
- [X] I have checked the [release documentation](http://www.open3d.org/docs/release/) and the [latest documentation](http://www.open3d.org/docs/latest/) (for `master` branch).

### Describe the issue

I have tried to adapt the Kitti example to the S3DIS data set.
It looks like the download link for the pretrained weights from the [model zoo](https://storage.googleapis.com/open3d-releases/model-zoo/model_weights.txt) is private.

i tested all 3 links:
```
- S3DIS (validated on Area 5)
- randlanet_s3dis_202010091238.pth
- randlanet_s3dis_area5_202010091333utc.pth
- randlanet_s3dis_202010091238.zip
```

### Steps to reproduce the bug

```python

# download the weights.
ckpt_folder = "./logs/"
os.makedirs(ckpt_folder, exist_ok=True)
ckpt_path = ckpt_folder + "randlanet_s3dis_202010091238.pth"
randlanet_url = "https://storage.googleapis.com/open3d-releases/model-zoo/randlanet_s3dis_202010091238.pth"
if not os.path.exists(ckpt_path):
cmd = "wget {} -O {}".format(randlanet_url, ckpt_path)
os.system(cmd)
```

### Error message

Results in the error:
```
--2023-05-02 13:32:09-- https://storage.googleapis.com/open3d-releases/model-zoo/randlanet_s3dis_202010091238.pth
Resolving storage.googleapis.com (storage.googleapis.com)... 142.250.186.80, 172.217.18.112, 216.58.212.176, ...
Connecting to storage.googleapis.com (storage.googleapis.com)|142.250.186.80|:443... connected.
HTTP request sent, awaiting response... 403 Forbidden
2023-05-02 13:32:09 ERROR 403: Forbidden.
```

### Expected behavior

Pasting the download links to Google Chrome results in the denied of access:

```
This XML file does not appear to have any style information associated with it. The document tree is shown below.

AccessDenied
Access denied.
Anonymous caller does not have storage.objects.get access to the Google Cloud Storage object. Permission 'storage.objects.get' denied on resource (or it may not exist).

```

### Open3D, Python and System information

```markdown
- Operating system: Ubuntu 20.04 on a Docker Host Windows 10 64-bit
- Python version: (e.g. Python 3.10 / output from `import sys print(sys.version)`)
- Open3D version: 0.17.0
- Open3D?: pip
```

### Additional information

Could you please share pretrained weights for SemanticSegmentation on the S3DIS dataset with the RandLAnet model?