chore: set rust-version in Cargo.toml (#126) #398

Job	Run time
semver	25s
Check Style	17s
features	51s
Test with Miri	59s
Check MSRV (1.63)	50s
Test stable on ubuntu-latest	43s
Test stable on windows-latest	2m 11s
Test stable on macos-latest	26s
Test beta on ubuntu-latest	38s
Test beta on windows-latest	1m 18s
Test beta on macos-latest	31s
Test nightly on ubuntu-latest	31s
Test nightly on windows-latest	1m 7s
Test nightly on macos-latest	34s
Build docs	14s
CI is green	1s
	11m 36s

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