refactor(lib): reduce clippy warnings (#3805) #2925

Job	Run time
semver	2m 28s
Verify hyper.h is up to date	26s
Check Style	3s
features	36s
Test cargo-c support (FFI)	20s
minimal-versions	29s
Test C API (FFI)	25s
Test with Miri	2m 46s
Check MSRV	44s
udeps	22s
Test stable on ubuntu-latest	1m 10s
Test stable on windows-latest	3m 9s
Test stable on macOS-latest	1m 17s
Test beta on ubuntu-latest	1m 30s
Test beta on windows-latest	2m 15s
Test beta on macOS-latest	2m 19s
Test nightly on ubuntu-latest	1m 25s
Test nightly on windows-latest	2m 49s
Test nightly on macOS-latest	1m 40s
Build docs	23s
Check exposed types	19s
CI is green	1s
	26m 56s

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