Does aioboto3 Support Authentication with EC2 IAM Roles?

Describe the bug
While using the boto3 library, I can authenticate and interact with AWS services using the IAM role assigned to my EC2 instance. However, when attempting to perform similar operations with s3fs, I encounter errors. Below is the code snippet demonstrating the behavior with boto3 and the corresponding error with s3fs.

Environment:

• Python Version: 3.10
• OS name and version: ubuntu
• s3fs-2024.3.1

Sample code

import boto3

# Create boto3 client
s3 = boto3.client('s3')

# List contents of a bucket
response = s3.list_objects_v2(Bucket='your-bucket-name')
print(response)

import s3fs
fs = s3fs.S3FileSystem(anon=False)
# Attempt to list the same bucket with s3fs, expecting to use the same IAM role
print(fs.ls('your-bucket-name'))

Error log

Traceback (most recent call last):
  File "/home/ubuntu/.local/lib/python3.10/site-packages/s3fs/core.py", line 720, in _lsdir
    async for c in self._iterdir(
  File "/home/ubuntu/.local/lib/python3.10/site-packages/s3fs/core.py", line 770, in _iterdir
    async for i in it:
  File "/home/ubuntu/.local/lib/python3.10/site-packages/aiobotocore/paginate.py", line 30, in __anext__
    response = await self._make_request(current_kwargs)
  File "/home/ubuntu/.local/lib/python3.10/site-packages/aiobotocore/client.py", line 408, in _make_api_call
    raise error_class(parsed_response, operation_name)
botocore.exceptions.ClientError: An error occurred (AccessDenied) when calling the ListObjectsV2 operation: No AWSAccessKey was presented.

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/ubuntu/.local/lib/python3.10/site-packages/fsspec/asyn.py", line 118, in wrapper
    return sync(self.loop, func, *args, **kwargs)
  File "/home/ubuntu/.local/lib/python3.10/site-packages/fsspec/asyn.py", line 103, in sync
    raise return_result
  File "/home/ubuntu/.local/lib/python3.10/site-packages/fsspec/asyn.py", line 56, in _runner
    result[0] = await coro
  File "/home/ubuntu/.local/lib/python3.10/site-packages/s3fs/core.py", line 1005, in _ls
    files = await self._lsdir(path, refresh, versions=versions)
  File "/home/ubuntu/.local/lib/python3.10/site-packages/s3fs/core.py", line 733, in _lsdir
    raise translate_boto_error(e)
PermissionError: No AWSAccessKey was presented.

Start with the reported calls in s3fs/core.py, especially _lsdir, _iterdir, and _ls, and compare S3FileSystem(anon=False) with the working boto3 client. Reproduce the EC2 IAM-role case using the provided sample and verify whether fs.ls can list the bucket without an access key; document or fix the behavior based on that result.