Update Python version requirement and clean up imports

- Changed the required Python version in `pyproject.toml` from 3.11 to 3.10 to broaden compatibility.
- Removed an unused import from `oxi/conf.py` to streamline the code and improve readability.

oxi/conf.py

@@ -1,6 +1,6 @@
 from functools import cached_property
 import json
-from typing import TYPE_CHECKING, Generic, Iterator, Type, TypeVar
+from typing import TYPE_CHECKING, Generic, Iterator, TypeVar
 
 from pydantic import BaseModel