Fix wrong type annotations

[oliversen]

No description provided.

[Matoran]

They are correct you can use dotenv_path or stream to create a dotenv (which make both optionals). Encoding is also optional for tempfile https://docs.python.org/3/library/tempfile.html.

[oliversen]

If the Optional type is specified, then we must set the default value for the parameter. In this case, it is necessary to rewrite further code.
Correctly dotenv_path: StrPath or dotenv_path: Optional[StrPath] = None

[Matoran]

I agree with dotenv_path: Optional[StrPath] = None, the DotEnv object is build on load_dotenv which first arg is dotenv_path: Optional[StrPath] = None.