Fix python type hints not compatible with Python 3.9

import sys

from pathlib import Path

from tempfile import TemporaryDirectory

from typing import Tuple

from typing import Tuple, Optional

import numpy as np

import pytest

    get_ssnr=False,

    get_odg=False,

    get_odg_bin=False,

    delay_profile: Path | None=None,

    delay_profile: Optional[Path]=None,

) -> str:

    """

    Runs the full split rendering chain consisting of