Pin pydantic and fastapi versions

[merveenoyan]

Hello 👋
This repository has both deepspeed and fastapi as a dependency. deepspeed doesn't support pydantic > 2.0.0 which results in below error (included in DeepSpeed/issues/3963) when I install this repository with pip:

RuntimeError: Failed to import transformers.models.llama.modeling_llama because of the following error (look up to see its traceback):
'FieldInfo' object has no attribute 'required'

For the time being, it would be nice to pin the fastapi and pydantic versions in this repository.
Addition: Also llava requires transformers 4.31.0 but Obsidian depends on Mistral integration which is >4.34.0