Modernize Python typing across the codebase

Automated via ruff UP006, UP007, UP035, UP045 rules (target: py311):

- Replace `typing.List`, `Dict`, `Tuple`, `Set`, `FrozenSet`, `Type`
  with their built-in equivalents (`list`, `dict`, `tuple`, etc.)
- Replace `typing.Optional[X]` with `X | None`
- Replace `typing.Union[X, Y]` with `X | Y`
- Move `Mapping`, `Sequence`, `Callable`, `Awaitable`,
  `MutableMapping`, `MutableSequence`, `Iterator`, `AsyncIterator`,
  `AsyncGenerator` imports from `typing` to `collections.abc`
- Remove now-unused `typing` imports
- Add `from __future__ import annotations` to 5 files that use
  forward-reference strings in `X | "Y"` annotations

scripts/krisp/audio_file_utils.py

@@ -5,13 +5,12 @@ handling format detection and conversion to int16 PCM format.
 """
 
 import sys
-from typing import Tuple
 
 import numpy as np
 import soundfile as sf
 
 
-def read_audio_file(input_path: str, verbose: bool = False) -> Tuple[np.ndarray, int]:
+def read_audio_file(input_path: str, verbose: bool = False) -> tuple[np.ndarray, int]:
     """Read an audio file and convert to int16 mono format.
 
     This function: