fix: ensure concurrent server always responds to shutdown signal #7030

Job	Run time
Block fixup commits	7s
Check whether Cargo.lock is up to date	17s
Filter changes	2s
Shellcheck	7s
Spell Check with Typos	4s
Run cargo clippy	48s
Run format checks	5m 26s
Check for unused dependencies	1m 28s
Sort dependencies	2m 1s
Run cargo test	7m 37s
Run cargo audit	14s
Run cargo check on MSRV	34s
nightly / doc	32s
Check markdown	0s
	19m 17s

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