Update Rust crate async-std to 1.12

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
async-std (source)	dependencies	minor	1.9 -> 1.12

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Release Notes

async-rs/async-std (async-std)

v1.12.0

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Added

• std::task::spawn_blocking is now stabilized. We consider it a fundamental API for bridging between blocking code and async code, and we widely use it within async-std's own implementation.
• Add TryFrom implementations to convert TcpListener, TcpStream, UdpSocket, UnixDatagram, UnixListener, and UnixStream to their synchronous equivalents, including putting them back into blocking mode.

Changed

• async-std no longer depends on num_cpus; it uses functionality in the standard library instead (via async-global-executor).
• Miscellaneous documentation fixes and cleanups.

v1.11.0

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This release improves compile times by up to 55% on initial builds, and up to 75% on recompilation. Additionally we've added a few new APIs and made some tweaks.

Added

• TcpListener::into_incoming to convert a TcpListener into a stream of incoming TCP connections

Removed

• The internal extension_trait macro had been removed. This drastically improves compile times for async-std, but changes the way our documentation is rendered. This is a cosmetic change only, and all existing code should continue to work as it did before.

Changed

• Some internal code has been de-macro-ified, making for quicker compile times.
• We now use the default recursion limit.

Docs

• Several docs improvements / fixes.

v1.10.0

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This release comes with an assortment of small features and fixes.

Added

• File now implements Clone so that Files can be passed into closures for use in spawn_blocking.
  • File's contents are already wrapped in Arcs, so the implementation of Clone is straightforward.
• task::try_current() which returns a handle to the current task if called within the context of a task created by async-std.
• async_std::io now re-exports WriteExt directly.

Fixed

• write! now takes already written bytes into account on File.

Internal

• TcpStream now properly makes use of vectored IO.
• The net::*::Incoming implementations now do less allocation.

Docs

• Several docs improvements / fixes.

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