Pin versions for HuggingFace models

[Kenny Song]

As mentioned in #67 (comment), it would be ideal to pin the versions of models downloaded from HF so the scores don't unexpectedly change.

We can explicitly increment model versions in LangCheck releases.

[Chinh Nguyen]

Hi, let me work on this issue!

[Kenny Song]

Thanks @ThanhChinhBK!

[Kenny Song]

Hi @ThanhChinhBK! Are you still planning to work on this issue?

[Chinh Nguyen]

hi @kennysong sorry for the delay, was busy in a while, I will start working on this issue from this Saturday, is it fine?

[Kenny Song]

No worries! That's totally fine, just wanted to make sure you intended to work on this. If not, we can assign it to someone else.