Big diff: Use new "|" union syntax (#5872)

stdlib/wsgiref/util.pyi

@@ -1,4 +1,4 @@
-from typing import IO, Any, Callable, Optional
+from typing import IO, Any, Callable
 
 from .types import WSGIEnvironment
 
@@ -14,6 +14,6 @@ class FileWrapper:
 def guess_scheme(environ: WSGIEnvironment) -> str: ...
 def application_uri(environ: WSGIEnvironment) -> str: ...
 def request_uri(environ: WSGIEnvironment, include_query: bool = ...) -> str: ...
-def shift_path_info(environ: WSGIEnvironment) -> Optional[str]: ...
+def shift_path_info(environ: WSGIEnvironment) -> str | None: ...
 def setup_testing_defaults(environ: WSGIEnvironment) -> None: ...
 def is_hop_by_hop(header_name: str) -> bool: ...