Remove dead import.

src/textual/_doc.py

@@ -5,7 +5,7 @@ import inspect
 import os
 import shlex
 from pathlib import Path
-from typing import Awaitable, Callable, Coroutine, Iterable, cast
+from typing import Awaitable, Callable, Iterable, cast
 
 from textual._import_app import import_app
 from textual.app import App

tests/snapshot_tests/conftest.py

@@ -7,7 +7,7 @@ from datetime import datetime
 from operator import attrgetter
 from os import PathLike
 from pathlib import Path, PurePath
-from typing import Awaitable, Coroutine, Union, List, Optional, Callable, Iterable
+from typing import Awaitable, Union, List, Optional, Callable, Iterable
 
 import pytest
 from _pytest.config import ExitCode