deps: update rust crate async-std to 1.12.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
async-std (source)	dependencies	minor	1.11.0 -> 1.12.0

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Release Notes

async-rs/async-std

v1.12.0

Compare Source

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.

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[kodiakhq]

This PR currently has a merge conflict. Please resolve this and then re-add the automerge label.