test(support): fix up unused lint #2249

Job	Run time
Verify hyper.h is up to date	23s
Check Style	11s
Check MSRV	44s
features	31s
Test with Miri	1m 32s
Test C API (FFI)	34s
udeps	38s
Test stable on ubuntu-latest	1m 38s
Test stable on windows-latest	4m 3s
Test stable on macOS-latest	1m 56s
Test beta on ubuntu-latest	1m 58s
Test beta on windows-latest	3m 24s
Test beta on macOS-latest	2m 14s
Test nightly on ubuntu-latest	2m 48s
Test nightly on windows-latest	3m 50s
Test nightly on macOS-latest	3m 40s
Check exposed types	22s
Build docs	35s
CI is green	2s
	31m 3s

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