Fix slasher tests #17002

Job	Run time
check-code	7m 38s
Check for 'skip-ci' label	1s
check-msrv	4m 39s
target-branch-check	1s
cli-check	15m 58s
basic-simulator-ubuntu	20m 15s
beacon-chain-tests	4m 29s
cargo-udeps	6m 11s
compile-with-beta-compiler	13m 14s
debug-tests-ubuntu	5m 8s
dockerfile-ubuntu	14m 58s
doppelganger-protection-test	25m 57s
ef-tests-ubuntu	5m 12s
execution-engine-integration-ubuntu	12m 18s
fallback-simulator-ubuntu	18m 21s
network-tests	15m 14s
op-pool-tests	18m 47s
release-tests-ubuntu	23m 11s
release-tests-windows	30m 14s
slasher-tests	3m 9s
state-transition-vectors-ubuntu	9m 13s
test-suite-success	0s
	4h 14m 8s

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