fix(iroh-relay): fix client actors not closing #12291

Job	Run time
Android Build Only (aarch64-linux-android)	1m 4s
cargo deny	27s
Android Build Only (armv7-linux-androideabi)	1m 5s
Checking docs	52s
Checking fmt	21s
clippy_check	1m 51s
check_semver	2m 26s
codespell	4s
Cross Build Only (x86_64-unknown-freebsd)	43s
Cross Test (i686-unknown-linux-gnu)	2m 1s
Minimal Supported Rust Version	1m 8s
Build wasm32	57s
netsim-integration-tests / Netsim	6m 24s
CI Test Suite / Tests (ubuntu-latest, stable, all)	2m 46s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	2m 30s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	2m 15s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	2m 8s
CI Test Suite / Tests (ubuntu-latest, stable, none)	2m 21s
CI Test Suite / Tests (ubuntu-latest, stable, default)	2m 25s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	2m 37s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	2m 15s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	2m 16s
	40m 56s

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