CI: Upgrade actions/upload-artifact from v2 to v4 #4060

Job	Run time
cluster-benchmark (cluster_benchmark)	55s
external-stores (stores/rocksstore-v2)	6m 24s
examples (stable, memstore)	43s
examples (stable, raft-kv-memstore)	2m 30s
lint	12m 1s
examples (stable, raft-kv-memstore-generic-snapshot-data)	1m 9s
openraft-features (nightly, generic-snapshot-data)	1m 12s
examples (stable, raft-kv-memstore-opendal-snapshot-data)	1m 19s
examples (stable, raft-kv-memstore-singlethreaded)	57s
openraft-feature-test (nightly)	1m 2s
openraft-test (stable, 0)	3m 36s
openraft-feature-test (nightly, serde)	1m 0s
examples (stable, raft-kv-rocksdb)	8m 15s
openraft-test (nightly, 30)	3m 29s
examples (nightly, memstore)	1m 3s
openraft-feature-test (nightly, single-term-leader)	1m 19s
openraft-test (nightly, 0, single-term-leader)	3m 29s
examples (nightly, raft-kv-memstore)	2m 19s
openraft-feature-test (nightly, single-term-leader,serde,singlethreaded)	1m 4s
examples (nightly, raft-kv-memstore-generic-snapshot-data)	1m 24s
examples (nightly, raft-kv-memstore-opendal-snapshot-data)	1m 37s
openraft-test-bench (nightly)	1m 7s
stores (memstore)	58s
examples (nightly, raft-kv-memstore-singlethreaded)	1m 27s
stores (rocksstore)	6m 12s
stores (sledstore)	1m 8s
examples (nightly, raft-kv-rocksdb)	12m 40s
Build (nightly, bench,serde,bt,singlethreaded)	51s
tests-feature-test (nightly)	2m 59s
tests-feature-test (nightly, single-term-leader)	2m 53s
tests-feature-test (nightly, loosen-follower-log-revert)	2m 54s
	1h 29m 56s

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