`blog_authorship_corpus` is broken
## Describe the bug
The dataset `blog_authorship_corpus` is broken.
By bypassing the checksum checks, the loading does not return any error but the resulting dataset is empty.
I suspect it is because the data download url is broken (http://www.cs.biu.ac.il/~koppel/blogs/blogs.zip).

## Steps to reproduce the bug
```python
from datasets import load_dataset
ds = load_dataset("blog_authorship_corpus", split="train", download_mode='force_redownload')
```

## Expected results
No error.

## Actual results
```
---------------------------------------------------------------------------
NonMatchingChecksumError                  Traceback (most recent call last)
/tmp/ipykernel_5237/1729238701.py in <module>
      2 ds = load_dataset(
      3     "blog_authorship_corpus", split="train",
----> 4     download_mode='force_redownload'
      5 )

/opt/conda/lib/python3.7/site-packages/datasets/load.py in load_dataset(path, name, data_dir, data_files, split, cache_dir, features, download_config, download_mode, ignore_verifications, keep_in_memory, save_infos, script_version, use_auth_token, task, streaming, **config_kwargs)
   1115         ignore_verifications=ignore_verifications,
   1116         try_from_hf_gcs=try_from_hf_gcs,
-> 1117         use_auth_token=use_auth_token,
   1118     )
   1119 

/opt/conda/lib/python3.7/site-packages/datasets/builder.py in download_and_prepare(self, download_config, download_mode, ignore_verifications, try_from_hf_gcs, dl_manager, base_path, use_auth_token, **download_and_prepare_kwargs)
    635                     if not downloaded_from_gcs:
    636                         self._download_and_prepare(
--> 637                             dl_manager=dl_manager, verify_infos=verify_infos, **download_and_prepare_kwargs
    638                         )
    639                     # Sync info

/opt/conda/lib/python3.7/site-packages/datasets/builder.py in _download_and_prepare(self, dl_manager, verify_infos, **prepare_split_kwargs)
    707         if verify_infos:
    708             verify_checksums(
--> 709                 self.info.download_checksums, dl_manager.get_recorded_sizes_checksums(), "dataset source files"
    710             )
    711 

/opt/conda/lib/python3.7/site-packages/datasets/utils/info_utils.py in verify_checksums(expected_checksums, recorded_checksums, verification_name)
     38     if len(bad_urls) > 0:
     39         error_msg = "Checksums didn't match" + for_verification_name + ":\n"
---> 40         raise NonMatchingChecksumError(error_msg + str(bad_urls))
     41     logger.info("All the checksums matched successfully" + for_verification_name)
     42 

NonMatchingChecksumError: Checksums didn't match for dataset source files:
['http://www.cs.biu.ac.il/~koppel/blogs/blogs.zip']
```

## Environment info
- `datasets` version: 1.13.2
- Platform: Linux-4.19.0-18-cloud-amd64-x86_64-with-debian-10.11
- Python version: 3.7.10
- PyArrow version: 5.0.0