Move local runtime flavor to unstable section

Author: Darksonn

tokio/CHANGELOG.md

@@ -6,7 +6,6 @@ The MSRV is increased to 1.71.
 
 - fs: add `File::max_buf_size` ([#7594])
 - io: export `Chain` of `AsyncReadExt::chain` ([#7599])
-- macros: add `local` runtime flavor ([#7375], [#7597])
 - net: add `SocketAddr::as_abstract_name` ([#7491])
 - net: add `TcpStream::quickack` and `TcpStream::set_quickack` ([#7490])
 - net: implement `AsRef<Self>` for `TcpStream` and `UnixStream` ([#7573])
@@ -40,6 +39,7 @@ The MSRV is increased to 1.71.
 - fs: support `io_uring` in `fs::write` ([#7567])
 - fs: support `io_uring` with `File::open()` ([#7617])
 - fs: support `io_uring` with `OpenOptions` ([#7321])
+- macros: add `local` runtime flavor ([#7375], [#7597])
 
 ### Documented