Third-party stubs: audit Callable[<parameters>, None] annotations (#8175)

stubs/waitress/waitress/trigger.pyi

@@ -16,7 +16,7 @@ class _triggerbase:
     def handle_connect(self) -> None: ...
     def handle_close(self) -> None: ...
     def close(self) -> None: ...
-    def pull_trigger(self, thunk: Callable[[None], None] | None = ...) -> None: ...
+    def pull_trigger(self, thunk: Callable[[None], object] | None = ...) -> None: ...
     def handle_read(self) -> None: ...
 
 if sys.platform == "linux" or sys.platform == "darwin":

stubs/waitress/waitress/utilities.pyi

@@ -1,4 +1,5 @@
-from collections.abc import Callable, Mapping, Sequence
+from _typeshed.wsgi import StartResponse
+from collections.abc import Iterator, Mapping, Sequence
 from logging import Logger
 from typing import Any, Match, Pattern
 
@@ -43,7 +44,7 @@ class Error:
     body: str = ...
     def __init__(self, body: str) -> None: ...
     def to_response(self) -> tuple[str, Sequence[tuple[str, str]], str]: ...
-    def wsgi_response(self, environ: Any, start_response: Callable[[str, Sequence[tuple[str, str]]], None]) -> str: ...
+    def wsgi_response(self, environ: Any, start_response: StartResponse) -> Iterator[str]: ...
 
 class BadRequest(Error):
     code: int = ...