refactor(common): replace Never with Infallible #138

Job	Run time
Check Style	7s
Test with Miri	58s
Check MSRV (1.63)	4m 1s
features	1m 5s
Test stable on ubuntu-latest	1m 54s
Test stable on windows-latest	1m 48s
Test stable on macOS-latest	1m 11s
Test beta on ubuntu-latest	42s
Test beta on windows-latest	1m 24s
Test beta on macOS-latest	1m 27s
Test nightly on ubuntu-latest	34s
Test nightly on windows-latest	1m 13s
Test nightly on macOS-latest	1m 5s
Build docs	27s
CI is green	2s
	17m 58s

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