chore: release Tokio v1.39.0

[Darksonn]

1.39.0 (July 22nd, 2024)

This release bumps the MSRV to 1.70. (#6645)

Added

• io: implement AsyncSeek for Empty (#6663)
• metrics: stabilize num_alive_tasks (#6619, #6667)
• process: add Command::as_std_mut (#6608)
• sync: add watch::Sender::same_channel (#6637)
• sync: add {Receiver,UnboundedReceiver}::{sender_strong_count,sender_weak_count} (#6661)
• sync: implement Default for watch::Sender (#6626)
• task: implement Clone for AbortHandle (#6621)
• task: stabilize consume_budget (#6622)

Changed

• io: improve panic message of ReadBuf::put_slice() (#6629)
• io: read during write in copy_bidirectional and copy (#6532)
• task: avoid stack overflow when passing large future to block_on (#6692)
• time: avoid traversing entries in the time wheel twice (#6584)

Fixed

• docs: fix docsrs builds with the fs feature enabled (#6585)
• io: only use short-read optimization on known-to-be-compatible platforms (#6668)
• time: fix overflow panic when using large durations with Interval (#6612)

Added (unstable)

• macros: allow unhandled_panic behavior for #[tokio::main] and #[tokio::test] (#6593)
• metrics: add spawned_tasks_count (#6114)

Documented

• io: update tokio::io::stdout documentation (#6674)
• macros: typo fix in join.rs and try_join.rs (#6641)
• runtime: fix typo in unhandled_panic (#6660)
• task: document behavior of JoinSet::try_join_next when all tasks are running (#6671)

[Darksonn]

#6707 must be merged first.

[Darksonn]

Oh right ... we should merge the mio upgrade first.