fix(client): add missing without_shutdown method #2394

Job	Run time
Check Style	13s
Verify hyper.h is up to date	26s
Test C API (FFI)	25s
Test with Miri	1m 7s
minimal-versions	24s
features	22s
Check MSRV	57s
udeps	26s
Test stable on ubuntu-latest	1m 11s
Test stable on windows-latest	2m 3s
Test stable on macOS-latest	2m 13s
Test beta on ubuntu-latest	1m 25s
Test beta on windows-latest	2m 29s
Test beta on macOS-latest	3m 29s
Test nightly on ubuntu-latest	1m 33s
Test nightly on windows-latest	2m 34s
Test nightly on macOS-latest	2m 33s
Build docs	27s
Check exposed types	27s
CI is green	1s
	24m 45s

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