Fix AllenNLP QA example

[epwalsh]

No description provided.

[LysandreJik]

Thanks @epwalsh!

[osanseviero]

Thank you @epwalsh!

I think the same bug might be in the Inference API. If possible, could you update the code in the docker image (just this line)? If not, we're happy to send a follow-up PR

[LysandreJik]

The inference-api will also need to be updated to use a more recent version of AllenNLP; right now it's using an old fork of mine (hence why it works without the hf://), it should probably just use the latest version available and pin it. It's done in the AllenNLP requirements: https://github.com/huggingface/huggingface_hub/blob/main/api-inference-community/docker_images/allennlp/requirements.txt

cc @Narsil

[epwalsh]

@LysandreJik, thanks, I'll update that as well 👍

[osanseviero]

Thank you!