Set `timeout` to `None` to avoid timeout errors

[JR-1991]

Overview

In issue #187, it was noted that the current implementation using httpx throws an exception when a timeout exceeds 5 seconds. This can be problematic when uploading bulk data to Dataverse, as server-side processing times can cause delays and trigger the exception. This pull request sets the timeout parameter to None, which is equivalent to an unlimited timeout. We may need to consider whether this approach is reasonable or if a specific time limit would be more appropriate.

TLDR

• Set timeout to None for no timeout

Tasks

• [x] Decide if unlimited or a certain time is appropriate
• [x] Add test to upload bulk data to verify functionality

Closes #187

[JR-1991]

@pdurbin thanks! Will deliver the tests soon and then we can merge it