version: bump to version v0.5.0-alpha.rc1 #3499

Job	Run time
Compilation check	42s
cross compilation	3m 53s
Format check	19s
Docker build check	3m 39s
run itests	9m 25s
run itests postgres	17m 54s
Lint check	2m 27s
migration version check	11s
go mod check	20s
RPC check	1m 13s
run LiT tests	6m 16s
sample configuration check	32s
Sqlc check	2m 49s
test vector check	46s
run unit tests (unit-race)	11m 32s
run unit tests (unit-cover)	2m 24s
run unit tests (unit dbbackend=postgres)	6m 10s
finish	5s
	1h 10m 37s

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