Fix: add missing RaftStateMachine trait bound #4342

Job	Run time
openraft-test-bench (nightly)	1m 0s
cluster-benchmark (cluster_benchmark)	51s
openraft-feature-test (nightly)	56s
openraft-feature-test (nightly, serde)	54s
rt-monoio	42s
openraft-feature-test (nightly, serde,singlethreaded)	52s
stores (stores/memstore)	54s
test-crate-openraft (stable)	55s
test-crate-tests (stable, 0)	3m 16s
Build (nightly, bench,serde,bt,singlethreaded)	54s
test-crate-openraft (nightly)	49s
test-crate-tests (nightly, 30)	3m 13s
test-crate-tests (nightly, 0, single-term-leader)	3m 1s
tests-feature-test (nightly)	3m 14s
tests-feature-test (nightly, single-term-leader)	3m 6s
lint	3m 52s
examples (stable, memstore)	48s
examples (stable, rocksstore)	5m 50s
examples (stable, raft-kv-memstore)	2m 35s
examples (stable, raft-kv-memstore-grpc)	1m 58s
examples (stable, raft-kv-memstore-network-v2)	57s
examples (stable, raft-kv-memstore-opendal-snapshot-data)	1m 13s
examples (stable, raft-kv-memstore-singlethreaded)	1m 4s
examples (stable, raft-kv-rocksdb)	7m 32s
examples (nightly, memstore)	1m 0s
examples (nightly, rocksstore)	10m 11s
examples (nightly, raft-kv-memstore)	2m 18s
examples (nightly, raft-kv-memstore-grpc)	1m 50s
examples (nightly, raft-kv-memstore-network-v2)	1m 11s
examples (nightly, raft-kv-memstore-opendal-snapshot-data)	1m 30s
examples (nightly, raft-kv-memstore-singlethreaded)	1m 10s
examples (nightly, raft-kv-rocksdb)	11m 38s
	1h 21m 14s

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