Officially sunset async-std #1216

Job	Run time
Check tokio02 feature	15s
Build with no-std	13s
Checking fmt and docs	30s
Build and test (ubuntu-latest, nightly)	1m 13s
Check io_safety feature (ubuntu-latest)	9s
Check wasm targets (nightly)	32s
Build and test (ubuntu-latest, beta)	1m 31s
Check io_safety feature (windows-latest)	1m 21s
Check wasm targets (beta)	36s
Cross compile (i686-unknown-linux-gnu)	1m 50s
Build and test (ubuntu-latest, stable)	1m 39s
Check wasm targets (stable)	25s
Cross compile (powerpc-unknown-linux-gnu)	1m 58s
Build and test (ubuntu-latest, 1.63)	4m 38s
Cross compile (powerpc64-unknown-linux-gnu)	1m 59s
Build and test (windows-latest, nightly)	2m 40s
Cross compile (arm-linux-androideabi)	3m 19s
Build and test (windows-latest, beta)	2m 51s
Build and test (windows-latest, stable)	3m 19s
Build and test (windows-latest, 1.63)	6m 7s
Build and test (macOS-latest, nightly)	1m 8s
Build and test (macOS-latest, beta)	1m 13s
Build and test (macOS-latest, stable)	1m 1s
Build and test (macOS-latest, 1.63)	3m 26s
	43m 53s

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