Use PEP 604 syntax wherever possible (#7493)

stdlib/sys.pyi

@@ -5,20 +5,7 @@ from importlib.abc import PathEntryFinder
 from importlib.machinery import ModuleSpec
 from io import TextIOWrapper
 from types import FrameType, ModuleType, TracebackType
-from typing import (
-    Any,
-    AsyncGenerator,
-    Callable,
-    Coroutine,
-    NoReturn,
-    Optional,
-    Protocol,
-    Sequence,
-    TextIO,
-    TypeVar,
-    Union,
-    overload,
-)
+from typing import Any, AsyncGenerator, Callable, Coroutine, NoReturn, Protocol, Sequence, TextIO, TypeVar, Union, overload
 from typing_extensions import Literal, final
 
 _T = TypeVar("_T")
@@ -255,7 +242,7 @@ _ProfileFunc = Callable[[FrameType, str, Any], Any]
 def getprofile() -> _ProfileFunc | None: ...
 def setprofile(profilefunc: _ProfileFunc | None) -> None: ...
 
-_TraceFunc = Callable[[FrameType, str, Any], Optional[Callable[[FrameType, str, Any], Any]]]
+_TraceFunc = Callable[[FrameType, str, Any], Callable[[FrameType, str, Any], Any] | None]
 
 def gettrace() -> _TraceFunc | None: ...
 def settrace(tracefunc: _TraceFunc | None) -> None: ...
@@ -322,7 +309,7 @@ if sys.version_info >= (3, 8):
     def addaudithook(hook: Callable[[str, tuple[Any, ...]], Any]) -> None: ...
     def audit(__event: str, *args: Any) -> None: ...
 
-_AsyncgenHook = Optional[Callable[[AsyncGenerator[Any, Any]], None]]
+_AsyncgenHook = Callable[[AsyncGenerator[Any, Any]], None] | None
 
 @final
 class _asyncgen_hooks(structseq[_AsyncgenHook], tuple[_AsyncgenHook, _AsyncgenHook]):