chore: prepare Tokio v1.49.0

[Darksonn]

1.49.0 (January 3rd, 2026)

Added

• net: add support for TCLASS option on IPv6 (#7781)
• runtime: stabilize runtime::id::Id (#7125)
• task: implement Extend for JoinSet (#7195)
• task: stabilize the LocalSet::id() (#7776)

Changed

• net: deprecate {TcpStream,TcpSocket}::set_linger (#7752)

Fixed

• macros: fix the hygiene issue of join! and try_join! (#7766)
• runtime: revert "replace manual vtable definitions with Wake" (#7699)
• sync: return TryRecvError::Disconnected from Receiver::try_recv after Receiver::close (#7686)
• task: remove unnecessary trait bounds on the Debug implementation (#7720)

Unstable

• fs: handle EINTR in fs::write for io-uring (#7786)
• fs: support io-uring with tokio::fs::read (#7696)
• runtime: disable io-uring on EPERM (#7724)
• time: add alternative timer for better multicore scalability (#7467)

Documented

• docs: fix a typos in bounded.rs and park.rs (#7817)
• io: add SyncIoBridge cross-references to copy and copy_buf (#7798)
• io: doc that AsyncWrite does not inherit from std::io::Write (#7705)
• metrics: clarify that num_alive_tasks is not strongly consistent (#7614)
• net: clarify the cancellation safety of the TcpStream::peek (#7305)
• net: clarify the drop behavior of unix::OwnedWriteHalf (#7742)
• net: clarify the platform-dependent backlog in TcpSocket docs (#7738)
• runtime: mention LocalRuntime in new_current_thread docs (#7820)
• sync: add missing period to mpsc::Sender::try_send docs (#7721)
• sync: clarify the cancellation safety of oneshot::Receiver (#7780)
• sync: improve the docs for the errors of mpsc (#7722)
• task: add example for spawn_local usage on local runtime (#7689)