chore(ci): pin tokio-util in MSRV CI job (#149) #475

Job	Run time
semver	2m 28s
Check Style	5s
features	43s
Test with Miri	47s
Check MSRV (1.63)	2m 5s
Test stable on ubuntu-latest	29s
Test stable on windows-latest	1m 42s
Test stable on macos-latest	28s
Test beta on ubuntu-latest	38s
Test beta on windows-latest	1m 15s
Test beta on macos-latest	46s
Test nightly on ubuntu-latest	35s
Test nightly on windows-latest	1m 24s
Test nightly on macos-latest	39s
Build docs	14s
CI is green	1s
	14m 19s

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