chore(common): replace Never with Infallible #2178

Job	Run time
Check Style	6s
Verify hyper.h is up to date	1m 17s
Test with Miri	1m 13s
features	36s
Test C API (FFI)	1m 1s
Check MSRV	5m 1s
Test stable on ubuntu-latest	2m 1s
udeps	29s
Test stable on windows-latest	4m 22s
Test stable on macOS-latest	2m 35s
Test beta on ubuntu-latest	2m 16s
Test beta on windows-latest	3m 5s
Test beta on macOS-latest	3m 4s
Test nightly on ubuntu-latest	2m 3s
Test nightly on windows-latest	4m 20s
Test nightly on macOS-latest	2m 48s
Check exposed types	26s
Build docs	26s
CI is green	3s
	37m 12s

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