AttributeError: module 'PIL.Image' has no attribute 'ExifTags'
When trying to load an image dataset in an old Python environment (with Pillow-8.4.0), an error is raised:
```Python traceback
AttributeError: module 'PIL.Image' has no attribute 'ExifTags'
```
The error traceback:
```Python traceback
~/huggingface/datasets/src/datasets/iterable_dataset.py in __iter__(self)
   1391                 # `IterableDataset` automatically fills missing columns with None.
   1392                 # This is done with `_apply_feature_types_on_example`.
-> 1393                 example = _apply_feature_types_on_example(
   1394                     example, self.features, token_per_repo_id=self._token_per_repo_id
   1395                 )

~/huggingface/datasets/src/datasets/iterable_dataset.py in _apply_feature_types_on_example(example, features, token_per_repo_id)
   1080     encoded_example = features.encode_example(example)
   1081     # Decode example for Audio feature, e.g.
-> 1082     decoded_example = features.decode_example(encoded_example, token_per_repo_id=token_per_repo_id)
   1083     return decoded_example
   1084 

~/huggingface/datasets/src/datasets/features/features.py in decode_example(self, example, token_per_repo_id)
   1974 
-> 1975         return {
   1976             column_name: decode_nested_example(feature, value, token_per_repo_id=token_per_repo_id)
   1977             if self._column_requires_decoding[column_name]

~/huggingface/datasets/src/datasets/features/features.py in <dictcomp>(.0)
   1974 
   1975         return {
-> 1976             column_name: decode_nested_example(feature, value, token_per_repo_id=token_per_repo_id)
   1977             if self._column_requires_decoding[column_name]
   1978             else value

~/huggingface/datasets/src/datasets/features/features.py in decode_nested_example(schema, obj, token_per_repo_id)
   1339         # we pass the token to read and decode files from private repositories in streaming mode
   1340         if obj is not None and schema.decode:
-> 1341             return schema.decode_example(obj, token_per_repo_id=token_per_repo_id)
   1342     return obj
   1343 

~/huggingface/datasets/src/datasets/features/image.py in decode_example(self, value, token_per_repo_id)
    187             image = PIL.Image.open(BytesIO(bytes_))
    188         image.load()  # to avoid "Too many open files" errors
--> 189         if image.getexif().get(PIL.Image.ExifTags.Base.Orientation) is not None:
    190             image = PIL.ImageOps.exif_transpose(image)
    191         if self.mode and self.mode != image.mode:

~/huggingface/datasets/venv/lib/python3.9/site-packages/PIL/Image.py in __getattr__(name)
     75                 )
     76                 return categories[name]
---> 77         raise AttributeError(f"module '{__name__}' has no attribute '{name}'")
     78 
     79 

AttributeError: module 'PIL.Image' has no attribute 'ExifTags'
```

### Environment info

Since datasets 2.19.0