[Merged by Bors] - Upgrade to v1.4.0-beta.3 #14378

Job	Run time
release-tests-windows	19m 43s
debug-tests-ubuntu	8m 21s
beacon-chain-tests	15m 19s
network-tests	23m 38s
op-pool-tests	37m 42s
release-tests-ubuntu	19m 51s
slasher-tests	5m 23s
state-transition-vectors-ubuntu	17m 30s
target-branch-check	2s
check-code	11m 38s
check-msrv	11m 26s
dockerfile-ubuntu	34m 51s
doppelganger-protection-test	17m 54s
ef-tests-ubuntu	11m 26s
eth1-simulator-ubuntu	36m 36s
merge-transition-ubuntu	38m 17s
execution-engine-integration-ubuntu	14m 5s
no-eth1-simulator-ubuntu	42m 40s
syncing-simulator-ubuntu	39m 19s
cargo-udeps	10m 3s
compile-with-beta-compiler	22m 41s
	7h 18m 25s

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