remove 'static lifetime bound on http1/2 client IO #2743

Job	Run time
semver	22s
Check Style	9s
Verify hyper.h is up to date	11s
Test C API (FFI)	49s
features	42s
minimal-versions	29s
Test with Miri	2m 16s
Check MSRV	1m 40s
udeps	24s
Test stable on ubuntu-latest	1m 16s
Test stable on windows-latest	3m 27s
Test stable on macOS-latest	1m 16s
Test beta on ubuntu-latest	1m 7s
Test beta on windows-latest	1m 53s
Test beta on macOS-latest	1m 18s
Test nightly on ubuntu-latest	1m 21s
Test nightly on windows-latest	2m 40s
Test nightly on macOS-latest	1m 29s
Build docs	20s
Check exposed types	14s
CI is green	1s
	23m 24s

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