version: bump to version v0.5.0-alpha.rc1 #3503

Job	Run time
test vector check	49s
go mod check	20s
Compilation check	39s
cross compilation	4m 25s
Docker build check	3m 44s
Format check	24s
Lint check	2m 45s
migration version check	8s
RPC check	1m 10s
sample configuration check	35s
Sqlc check	35s
run unit tests (unit-race)	11m 22s
run unit tests (unit-cover)	2m 46s
run itests	9m 34s
run itests postgres	17m 57s
run unit tests (unit dbbackend=postgres)	6m 12s
run LiT tests	17m 30s
finish	6s
	1h 21m 1s

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