Bump litd to version `v0.12.4-alpha` #1419

Job	Run time
frontend tests on ubuntu-latest	2m 18s
check commits	42s
frontend tests on windows-latest	5m 54s
integration test	6m 53s
backend build on ubuntu-latest	2m 30s
frontend tests on macOS-latest	5m 55s
backend build on windows-latest	15m 31s
lint	3m 0s
RPC proto compilation check	3m 34s
backend build on macOS-latest	10m 33s
unit tests	20s
unit-race	25s
	57m 35s

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