platform, tarfile, io: Python 3.13 updates (#12056)

stdlib/io.pyi

@@ -75,7 +75,7 @@ class IOBase(metaclass=abc.ABCMeta):
     def __del__(self) -> None: ...
     @property
     def closed(self) -> bool: ...
-    def _checkClosed(self, msg: str | None = ...) -> None: ...  # undocumented
+    def _checkClosed(self) -> None: ...  # undocumented
 
 class RawIOBase(IOBase):
     def readall(self) -> bytes: ...