Add the new stability attributes, for Windows.

Author: sunfishcode

library/std/src/os/windows/io/handle.rs

@@ -188,6 +188,7 @@ impl OwnedHandle {
 impl BorrowedHandle<'_> {
     /// Creates a new `OwnedHandle` instance that shares the same underlying
     /// object as the existing `BorrowedHandle` instance.
+    #[stable(feature = "io_safety", since = "1.63.0")]
     pub fn try_clone_to_owned(&self) -> crate::io::Result<OwnedHandle> {
         self.duplicate(0, false, c::DUPLICATE_SAME_ACCESS)
     }

library/std/src/os/windows/io/socket.rs

@@ -107,6 +107,7 @@ impl OwnedSocket {
 impl BorrowedSocket<'_> {
     /// Creates a new `OwnedSocket` instance that shares the same underlying
     /// object as the existing `BorrowedSocket` instance.
+    #[stable(feature = "io_safety", since = "1.63.0")]
     pub fn try_clone_to_owned(&self) -> io::Result<OwnedSocket> {
         let mut info = unsafe { mem::zeroed::<c::WSAPROTOCOL_INFO>() };
         let result = unsafe {