Fix failing cargo-udeps #15242

Job	Run time
release-tests-ubuntu	14m 52s
release-tests-windows	33m 50s
ef-tests-ubuntu	15m 56s
beacon-chain-tests	19m 39s
debug-tests-ubuntu	10m 15s
dockerfile-ubuntu	14m 5s
network-tests	7m 55s
op-pool-tests	11m 11s
slasher-tests	1m 41s
state-transition-vectors-ubuntu	2m 31s
target-branch-check	1s
cargo-udeps	7m 21s
check-code	7m 46s
check-msrv	4m 27s
cli-check	20m 58s
compile-with-beta-compiler	13m 36s
doppelganger-protection-test	20m 4s
execution-engine-integration-ubuntu	16m 22s
eth1-simulator-ubuntu	20m 44s
merge-transition-ubuntu	20m 11s
no-eth1-simulator-ubuntu	18m 40s
syncing-simulator-ubuntu	12m 50s
test-suite-success	0s
	4h 54m 55s

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