Big diff: use lower-case list and dict (#5888)

stdlib/wsgiref/handlers.pyi

@@ -1,6 +1,6 @@
 from abc import abstractmethod
 from types import TracebackType
-from typing import IO, Callable, Dict, List, MutableMapping, Optional, Tuple, Type
+from typing import IO, Callable, MutableMapping, Optional, Tuple, Type
 
 from .headers import Headers
 from .types import ErrorStream, InputStream, StartResponse, WSGIApplication, WSGIEnvironment
@@ -9,7 +9,7 @@ from .util import FileWrapper
 _exc_info = Tuple[Optional[Type[BaseException]], Optional[BaseException], Optional[TracebackType]]
 
 def format_date_time(timestamp: float | None) -> str: ...  # undocumented
-def read_environ() -> Dict[str, str]: ...
+def read_environ() -> dict[str, str]: ...
 
 class BaseHandler:
     wsgi_version: Tuple[int, int]  # undocumented
@@ -28,7 +28,7 @@ class BaseHandler:
 
     traceback_limit: int | None
     error_status: str
-    error_headers: List[Tuple[str, str]]
+    error_headers: list[Tuple[str, str]]
     error_body: bytes
     def run(self, application: WSGIApplication) -> None: ...
     def setup_environ(self) -> None: ...
@@ -37,7 +37,7 @@ class BaseHandler:
     def set_content_length(self) -> None: ...
     def cleanup_headers(self) -> None: ...
     def start_response(
-        self, status: str, headers: List[Tuple[str, str]], exc_info: _exc_info | None = ...
+        self, status: str, headers: list[Tuple[str, str]], exc_info: _exc_info | None = ...
     ) -> Callable[[bytes], None]: ...
     def send_preamble(self) -> None: ...
     def write(self, data: bytes) -> None: ...
@@ -49,7 +49,7 @@ class BaseHandler:
     def client_is_modern(self) -> bool: ...
     def log_exception(self, exc_info: _exc_info) -> None: ...
     def handle_error(self) -> None: ...
-    def error_output(self, environ: WSGIEnvironment, start_response: StartResponse) -> List[bytes]: ...
+    def error_output(self, environ: WSGIEnvironment, start_response: StartResponse) -> list[bytes]: ...
     @abstractmethod
     def _write(self, data: bytes) -> None: ...
     @abstractmethod