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

stdlib/getpass.pyi

@@ -1,6 +1,6 @@
-from typing import Optional, TextIO
+from typing import TextIO
 
-def getpass(prompt: str = ..., stream: Optional[TextIO] = ...) -> str: ...
+def getpass(prompt: str = ..., stream: TextIO | None = ...) -> str: ...
 def getuser() -> str: ...
 
 class GetPassWarning(UserWarning): ...