[Bug]: requires pyarrow >=14.0.0

# Bug description

Hi team - thanks for releasing this!

I was trying to use `chug` to test using a large dataset as follows:

```
import chug

task_cfg = chug.DataTaskDocReadCfg(
page_sampling='all',
)
data_cfg = chug.DataCfg(
source='pixparse/pdfa-eng-wds',
split='train',
batch_size=None,
format='hfids',
num_workers=0,
)
data_loader = chug.create_loader(
data_cfg,
task_cfg,
)
sample = next(iter(data_loader))

```

However, I ran into issues with my local env, specifically around the pyarrow dependency. Originally, in my env I had `pyarrow==13.0.0`, however encountered the following bug when running the above code snippet:

```

ArrowInvalid Traceback (most recent call last)
Cell In[1], [line 13](vscode-notebook-cell:?execution_count=1&line=13)
[3](vscode-notebook-cell:?execution_count=1&line=3) task_cfg = chug.DataTaskDocReadCfg(
[4](vscode-notebook-cell:?execution_count=1&line=4) page_sampling='all',
[5](vscode-notebook-cell:?execution_count=1&line=5) )
[6](vscode-notebook-cell:?execution_count=1&line=6) data_cfg = chug.DataCfg(
[7](vscode-notebook-cell:?execution_count=1&line=7) source='pixparse/pdfa-eng-wds',
[8](vscode-notebook-cell:?execution_count=1&line=8) split='train',
(...)
[11](vscode-notebook-cell:?execution_count=1&line=11) num_workers=0,
[12](vscode-notebook-cell:?execution_count=1&line=12) )
---> [13](vscode-notebook-cell:?execution_count=1&line=13) data_loader = chug.create_loader(
[14](vscode-notebook-cell:?execution_count=1&line=14) data_cfg,
[15](vscode-notebook-cell:?execution_count=1&line=15) task_cfg,
[16](vscode-notebook-cell:?execution_count=1&line=16) )
[17](vscode-notebook-cell:?execution_count=1&line=17) sample = next(iter(data_loader))

File [~/miniconda3/envs/ocr_eval/lib/python3.10/site-packages/chug/loader.py:48](https://file+.vscode-resource.vscode-cdn.net/Users/nin/repos/ocr/~/miniconda3/envs/ocr_eval/lib/python3.10/site-packages/chug/loader.py:48), in create_loader(data_cfg, task_cfg, task_pipeline, is_training, start_interval, seed, distributed)
[37](https://file+.vscode-resource.vscode-cdn.net/Users/nin/repos/ocr/~/miniconda3/envs/ocr_eval/lib/python3.10/site-packages/chug/loader.py:37) loader = create_loader_from_config_wds(
[38](https://file+.vscode-resource.vscode-cdn.net/Users/nin/repos/ocr/~/miniconda3/envs/ocr_eval/lib/python3.10/site-packages/chug/loader.py:38) data_cfg=data_cfg,
[39](https://file+.vscode-resource.vscode-cdn.net/Users/nin/repos/ocr/~/miniconda3/envs/ocr_eval/lib/python3.10/site-packages/chug/loader.py:39) task_cfg=task_cfg,
(...)
[44](https://file+.vscode-resource.vscode-cdn.net/Users/nin/repos/ocr/~/miniconda3/envs/ocr_eval/lib/python3.10/site-packages/chug/loader.py:44) distributed=distributed,
[45](https://file+.vscode-resource.vscode-cdn.net/Users/nin/repos/ocr/~/miniconda3/envs/ocr_eval/lib/python3.10/site-packages/chug/loader.py:45) )
...
File [~/miniconda3/envs/ocr_eval/lib/python3.10/site-packages/pyarrow/error.pxi:144](https://file+.vscode-resource.vscode-cdn.net/Users/nin/repos/ocr/~/miniconda3/envs/ocr_eval/lib/python3.10/site-packages/pyarrow/error.pxi:144), in pyarrow.lib.pyarrow_internal_check_status()

File [~/miniconda3/envs/ocr_eval/lib/python3.10/site-packages/pyarrow/error.pxi:100](https://file+.vscode-resource.vscode-cdn.net/Users/nin/repos/ocr/~/miniconda3/envs/ocr_eval/lib/python3.10/site-packages/pyarrow/error.pxi:100), in pyarrow.lib.check_status()

ArrowInvalid: Unable to merge: Field json has incompatible types: struct>, images_bbox_no_text_overlap: list>, lines: struct>, score: list, text: list, word_slice: list>>, words: struct>, line_pos: list>, score: list, text: list>>>> vs struct, images_bbox_no_text_overlap: list, lines: struct>, score: list, text: list, word_slice: list>>, words: struct>, line_pos: list>, score: list, text: list>>>

```

Updating this to `pyarrow==14.0.0` resolved this bug. Since pyarrow version is not specifically outlined in the requirements, it may be useful to update this?