cleanups #20

Job	Run time
extract-msrv	5s
cargo-fmt	16s
compile-with-beta-compiler	29m 18s
target-branch-check	1s
beacon-chain-tests	1h 8m 24s
release-tests-ubuntu	1h 35m 24s
dockerfile-ubuntu	24m 10s
debug-tests-ubuntu	18m 44s
eth1-simulator-ubuntu	30m 27s
ef-tests-ubuntu	50m 51s
merge-transition-ubuntu	35m 23s
no-eth1-simulator-ubuntu	37m 9s
op-pool-tests	24m 43s
release-tests-windows	2h 38m 29s
slasher-tests	4m 50s
state-transition-vectors-ubuntu	16m 46s
arbitrary-check	1m 35s
cargo-audit	5m 13s
cargo-udeps	15m 37s
cargo-vendor	41s
check-benchmarks	9m 23s
check-msrv	7m 44s
clippy	9m 24s
doppelganger-protection-test	42m 57s
execution-engine-integration-ubuntu	24m 0s
syncing-simulator-ubuntu	29m 48s
	12h 21m 22s

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