Fix subnet unsubscription time #20033

Job	Run time
Check for 'skip-ci' label	1s
lockbud	14m 21s
check-code	22s
check-msrv	5m 33s
target-branch-check	1s
release-tests-windows	17m 46s
beacon-chain-tests	18m 2s
release-tests-ubuntu	18m 2s
op-pool-tests	18m 40s
network-tests	7m 54s
slasher-tests	3m 50s
basic-simulator-ubuntu	18m 23s
cargo-udeps	8m 14s
debug-tests-ubuntu	6m 30s
ef-tests-ubuntu	17m 3s
execution-engine-integration-ubuntu	10m 39s
fallback-simulator-ubuntu	18m 28s
state-transition-vectors-ubuntu	8m 27s
cargo-sort	18s
cli-check	16m 47s
compile-with-beta-compiler	14m 46s
test-suite-success	1s
	3h 44m 8s

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