client.tasks.list with fields = 'all' fails on comment_authors

Hi!

I am on Label Studio enterprise, on version 1.0.5. I am trying to get annotation data for a project via the SDK + API. The problem is that when I iterate over tasks, any task with a comment inevitably throws a pydantic `ValidationError`:

```
>>> tasks = ls.tasks.list(project=project_id, fields='all')
>>> for t in tasks:
... pass
...
Traceback (most recent call last):
File "", line 1, in
File "/home/ls/.st_env/lib/python3.10/site-packages/label_studio_sdk/_extensions/pager_ext.py", line 23, in __iter__
for item in super().__iter__():
File "/home/ls/.st_env/lib/python3.10/site-packages/label_studio_sdk/core/pagination.py", line 42, in __iter__
for page in self.iter_pages():
File "/home/ls/.st_env/lib/python3.10/site-packages/label_studio_sdk/core/pagination.py", line 53, in iter_pages
page = page.get_next()
File "/home/ls/.st_env/lib/python3.10/site-packages/label_studio_sdk/tasks/client.py", line 217, in
_get_next = lambda: self.list(
File "/home/ls/.st_env/lib/python3.10/site-packages/label_studio_sdk/tasks/client_ext.py", line 10, in list
return SyncPagerExt.from_sync_pager(super().list(**kwargs))
File "/home/ls/.st_env/lib/python3.10/site-packages/label_studio_sdk/tasks/client.py", line 215, in list
_parsed_response = pydantic_v1.parse_obj_as(TasksListResponse, _response.json()) # type: ignore
File "/home/ls/.st_env/lib/python3.10/site-packages/pydantic/v1/tools.py", line 38, in parse_obj_as
return model_type(__root__=obj).__root__
File "/home/ls/.st_env/lib/python3.10/site-packages/pydantic/v1/main.py", line 341, in __init__
raise validation_error
pydantic.v1.error_wrappers.ValidationError: 3 validation errors for ParsingModel[TasksListResponse]
__root__ -> tasks -> 11 -> comment_authors -> 0
value is not a valid integer (type=type_error.integer)
__root__ -> tasks -> 20 -> comment_authors -> 0
value is not a valid integer (type=type_error.integer)
__root__ -> tasks -> 78 -> comment_authors -> 0
value is not a valid integer (type=type_error.integer)
```

Let me know if there is any other information you might need.