Put datasets on S3

```
   @pytest.mark.timeout(120)
    @pytest.mark.internet()
    def test_download_visium_hne_image_crop(self, tmp_path: Path):
        with warnings.catch_warnings():
            warnings.simplefilter("ignore", category=OldFormatWarning)
            try:
>               img = sq.datasets.visium_hne_image_crop(tmp_path / "foo")
```

it keeps timing out and is flaky