Switch to PEP-604 syntax in python2 stubs (#5915)

Signed-off-by: oleg.hoefling <oleg.hoefling@gmail.com>

stdlib/@python2/winsound.pyi

@@ -1,5 +1,5 @@
 import sys
-from typing import Optional, Union, overload
+from typing import overload
 from typing_extensions import Literal
 
 if sys.platform == "win32":
@@ -21,7 +21,7 @@ if sys.platform == "win32":
     def Beep(frequency: int, duration: int) -> None: ...
     # Can actually accept anything ORed with 4, and if not it's definitely str, but that's inexpressible
     @overload
-    def PlaySound(sound: Optional[bytes], flags: Literal[4]) -> None: ...
+    def PlaySound(sound: bytes | None, flags: Literal[4]) -> None: ...
     @overload
-    def PlaySound(sound: Optional[Union[str, bytes]], flags: int) -> None: ...
+    def PlaySound(sound: str | bytes | None, flags: int) -> None: ...
     def MessageBeep(type: int = ...) -> None: ...