chore: use futures_util::ready #135

Job	Run time
Check Style	18s
Test with Miri	54s
features	49s
Check MSRV (1.63)	3m 14s
Test stable on ubuntu-latest	36s
Test stable on windows-latest	1m 36s
Test stable on macOS-latest	1m 9s
Test beta on ubuntu-latest	38s
Test beta on windows-latest	1m 11s
Test beta on macOS-latest	1m 7s
Test nightly on ubuntu-latest	3m 20s
Test nightly on windows-latest	1m 47s
Test nightly on macOS-latest	1m 5s
Build docs	29s
CI is green	3s
	18m 16s

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