Remove Pydantic Version Constraint Due to Inflect Update
I'll unpin it tomorrow, seems it should be fine. 
Currently, pydantic is pinned to version 1, which leads to conflicts with common frameworks such as fastapi.

https://github.com/NVIDIA/NeMo/blob/d3c589646b453f0395f19c2eef1ed958d048c6c7/requirements/requirements_common.txt#L4

It seems that inflect now supports pydantic 2, see https://github.com/jaraco/inflect/issues/187. Their requirements now list `pydantic >= 1.9.1`. Given this update, is it possible to remove the pydantic version constraint without further changes?