.github: bump upload-artifact action to v4 #1952

Job	Run time
check commits	4m 48s
integration test	19m 22s
frontend tests on ubuntu-latest	2m 13s
backend build on ubuntu-latest	2m 46s
frontend tests on windows-latest	7m 35s
lint	1m 58s
backend build on windows-latest	10m 54s
RPC proto compilation check	3m 27s
frontend tests on macOS-latest	1m 56s
backend build on macOS-latest	5m 46s
check release notes updated	2s
run unit tests (unit-race)	3m 51s
run unit tests (unit)	34s
	1h 5m 12s

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