Update sentence_transformers to version 3.1.1

[ethanke]

Hello !

I was using ragoon to try the new lemone release, and face a warning on my environement ;

torchvision.io`, you can ignore this warning. Otherwise, there might be something wrong with your environment. Did you have `libjpeg` or `libpng` installed before building `torchvision` from source?
  warn(
You try to use a model that was created with version 3.1.1, however, your version is 3.0.1. This might cause unexpected behavior or errors. In that case, try to update to the latest version.

Then i try to pip install --upgrade sentence_transformers to 3.1.1, but it say ragoon was using and need 3.0.1.

I will require strong vigilance from Reviewer as i'm not aware of all the consequences that have such a version bump from sentence_transformers

Thanks you so much for you're incredible work it give so much hope for french / open source community 🦝

[ethanke]

I confirm that on my end ; after different try everything seems to work as usual than before w/ warning using load_datasets, EmbeddingsDataLoader