Bump actions/upload-artifact from 3 to 4 #1981

Job	Run time
build (2_12, mima)	1m 23s
build (2_12, e2e)	9s
build (2_12, test)	11m 58s
build (2_13, mima)	1m 22s
build (2_13, e2e)	5s
build (2_13, test)	12m 3s
build (3, mima)	9s
build (3, e2e)	7s
build (3, test)	7m 30s
build (2_12, examples_and_formatting)	3m 4s
conformance	4m 3s
build (2_13, scala3_compat_test)	9m 8s
build (3, scala3_compat_test)	9m 0s
ci-passed	1s
	1h 0m 2s

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