no_sign_request=True does not skip AWS config ID

I'm receiving an `InvalidAccessKeyID` error after deleting my AWS configure ID from `maple`. I wanted to try the `no_sign_request=True` option before adding credentials back to maple, but received an error that I outline below.

As specified here, https://github.com/cytomining/CytoTable/issues/52#issuecomment-1553125402, I ran `cytotable.convert(..., no_sign_request=True)` (full command below)

```python
cytotable.convert(
source_path="s3://cellpainting-gallery/cpg0016-jump/source_1/workspace/backend/Batch1_20221004/UL001643"
dest_path="test2.parquet",
dest_datatype="parquet",
chunk_size=150000,
parsl_config=parsl_config,
no_sign_request=True,
preset="cellprofiler_sqlite_pycytominer"
)
```

But I received the following error:

```python
exception of type
1685550430.488742 2023-05-31 10:27:10 MainProcess-248907 HTEX-Queue-Management-Thread-139723934787136 parsl.dataflow.dflow:304 handle_exec_update DEBUG: Task 3 try 0 failed
1685550430.488833 2023-05-31 10:27:10 MainProcess-248907 HTEX-Queue-Management-Thread-139723934787136 parsl.dataflow.dflow:350 handle_exec_update ERROR: Task 3 failed after 0 retry attempts
Traceback (most recent call last):
File "/home/gway/miniconda3/envs/jump_sc/lib/python3.10/site-packages/parsl/dataflow/dflow.py", line 301, in handle_exec_update
res = self._unwrap_remote_exception_wrapper(future)
File "/home/gway/miniconda3/envs/jump_sc/lib/python3.10/site-packages/parsl/dataflow/dflow.py", line 567, in _unwrap_remote_exception_wrapper
result.reraise()
File "/home/gway/miniconda3/envs/jump_sc/lib/python3.10/site-packages/parsl/app/errors.py", line 122, in reraise
reraise(t, v, v.__traceback__)
File "/home/gway/miniconda3/envs/jump_sc/lib/python3.10/site-packages/six.py", line 719, in reraise
raise value
File "/home/gway/miniconda3/envs/jump_sc/lib/python3.10/site-packages/parsl/app/errors.py", line 160, in wrapper
return func(*args, **kwargs)
File "/home/gway/miniconda3/envs/jump_sc/lib/python3.10/site-packages/cytotable/sources.py", line 81, in _get_source_filepaths
if AnyPath(path).is_file()
File "/home/gway/miniconda3/envs/jump_sc/lib/python3.10/site-packages/cloudpathlib/s3/s3path.py", line 39, in is_file
return self.client._is_file_or_dir(self) == "file"
File "/home/gway/miniconda3/envs/jump_sc/lib/python3.10/site-packages/cloudpathlib/s3/s3client.py", line 164, in _is_file_or_dir
return self._s3_file_query(cloud_path)
File "/home/gway/miniconda3/envs/jump_sc/lib/python3.10/site-packages/cloudpathlib/s3/s3client.py", line 197, in _s3_file_query
return next(
File "/home/gway/miniconda3/envs/jump_sc/lib/python3.10/site-packages/cloudpathlib/s3/s3client.py", line 198, in
(
File "/home/gway/miniconda3/envs/jump_sc/lib/python3.10/site-packages/boto3/resources/collection.py", line 81, in __iter__
for page in self.pages():
File "/home/gway/miniconda3/envs/jump_sc/lib/python3.10/site-packages/boto3/resources/collection.py", line 171, in pages
for page in pages:
File "/home/gway/miniconda3/envs/jump_sc/lib/python3.10/site-packages/botocore/paginate.py", line 269, in __iter__
response = self._make_request(current_kwargs)
File "/home/gway/miniconda3/envs/jump_sc/lib/python3.10/site-packages/botocore/paginate.py", line 357, in _make_request
return self._method(**current_kwargs)
File "/home/gway/miniconda3/envs/jump_sc/lib/python3.10/site-packages/botocore/client.py", line 530, in _api_call
return self._make_api_call(operation_name, kwargs)
File "/home/gway/miniconda3/envs/jump_sc/lib/python3.10/site-packages/botocore/client.py", line 964, in _make_api_call
raise error_class(parsed_response, operation_name)
botocore.exceptions.ClientError: An error occurred (InvalidAccessKeyId) when calling the ListObjects operation: The AWS Access Key Id you provided does not exist in our records.
1685550430.490109 2023-
```

[parsl.log](https://github.com/cytomining/CytoTable/files/11616563/parsl.log)