Log Message:
py-pydantic-settings: update to 2.8.0.

Don't explode env vars if env_nested_delimiter is empty (#540)
Asynchronous CLI methods in CliApp (#533)
Avoid using Any in BaseSettings signature to avoid mypy errors (#529)
Add env_nested_max_split setting (#534)
Improve env_prefix config doc (#523)
CLI support for optional and variadic positional args (#519)