Bump tokio from 1.20.1 to 1.21.1

Bumps tokio from 1.20.1 to 1.21.1.

Release notes

Sourced from tokio's releases.

Tokio v1.21.1

1.21.1 (September 13, 2022)

Fixed

• net: fix dependency resolution for socket2 (#5000)
• task: ignore failure to set TLS in LocalSet Drop (#4976)

#4976: tokio-rs/tokio#4976 #5000: tokio-rs/tokio#5000

Tokio v1.21.0

1.21.0 (September 2, 2022)

This release is the first release of Tokio to intentionally support WASM. The sync,macros,io-util,rt,time features are stabilized on WASM. Additionally the wasm32-wasi target is given unstable support for the net feature.

Added

• net: add device and bind_device methods to TCP/UDP sockets (#4882)
• net: add tos and set_tos methods to TCP and UDP sockets (#4877)
• net: add security flags to named pipe ServerOptions (#4845)
• signal: add more windows signal handlers (#4924)
• sync: add mpsc::Sender::max_capacity method (#4904)
• sync: implement Weak version of mpsc::Sender (#4595)
• task: add LocalSet::enter (#4765)
• task: stabilize JoinSet and AbortHandle (#4920)
• tokio: add track_caller to public APIs (#4805, #4848, #4852)
• wasm: initial support for wasm32-wasi target (#4716)

Fixed

• miri: improve miri compatibility by avoiding temporary references in linked_list::Link impls (#4841)
• signal: don't register write interest on signal pipe (#4898)
• sync: add #[must_use] to lock guards (#4886)
• sync: fix hang when calling recv on closed and reopened broadcast channel (#4867)
• task: propagate attributes on task-locals (#4837)

Changed

• fs: change panic to error in File::start_seek (#4897)
• io: reduce syscalls in poll_read (#4840)
• process: use blocking threadpool for child stdio I/O (#4824)
• signal: make SignalKind methods const (#4956)

Internal changes

• rt: extract basic_scheduler::Config (#4935)
• rt: move I/O driver into runtime module (#4942)
• rt: rename internal scheduler types (#4945)

... (truncated)

Commits

• dea1cd4 chore: prepare Tokio v1.21.1 (#5003)
• e4cbc70 task: ignore failure to set TLS in LocalSet Drop (#4976)
• 97e981e net: fix dependency resolution for socket2 (#5000)
• 50795e6 chore: prepare Tokio v1.21.0 (#4967)
• a6a95bb wasm: add documentation for wasm support (#4966)
• ce5d2a4 task: fix some doc and test things related to stabilizing JoinSet (#4965)
• e5467ca tokio: increase LTS duration to one year (#4964)
• 431ec68 sync: doc of watch::Sender::send improved (#4959)
• f207e1a tokio: make 1.20.x an LTS release (#4962)
• d3cae06 wasm: use thread::sleep on non-wasi wasm too (#4963)
• Additional commits viewable in compare view

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