[BUG] return _winapi.DuplicateHandle

## Describe the bug
A clear and concise description of what the bug is.

Every question, it returns the following:
```bash
File "", line 1, in
from multiprocessing.spawn import spawn_main; spawn_main(parent_pid=17480, pipe_handle=1604)
~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\chigo\AppData\Local\Programs\Python\Python313\Lib\multiprocessing\spawn.py", line 113, in spawn_main
new_handle = reduction.duplicate(pipe_handle,
source_process=source_process)
File "C:\Users\chigo\AppData\Local\Programs\Python\Python313\Lib\multiprocessing\reduction.py", line 79, in duplicate
return _winapi.DuplicateHandle(
```

## To Reproduce
Please provide all the steps needed to reproduce the behavior, or provide a minimal working example if needed. We will ignore issues missing this section.

```bash
set OPENAI_BASE_URL=http://localhost:11434/v1
set OPENAI_API_KEY=apikey
lighteval eval --timeout 600 --max-connections 1 --max-tasks 1 openai/gpt-oss:20b gsm8k
```

## Expected behavior
A clear and concise description of what you expected to happen.

It should run without printing the warning every question.

## Version info
Please provide your operating system, lighteval version or commit if you installed from main, and pip/conda environment if your problem concerns dependencies.

Windows 10
commit 6496d623f0b2905ce3118ac13179c3a665194759
uv 0.8.13