private HybridPendingSplitsState deserializeLegacyHybridPendingSplitsState(
            int splitVersion, DataInputDeserializer in) throws IOException {
        SnapshotPendingSplitsState snapshotPendingSplitsState =
                deserializeLegacySnapshotPendingSplitsState(splitVersion, in);
        boolean isStreamSplitAssigned = in.readBoolean();
        return new HybridPendingSplitsState(snapshotPendingSplitsState, isStreamSplitAssigned);
    }
The {@link SimpleVersionedSerializer Serializer} for the {@link PendingSplitsState}.
Copy from com.ververica:flink-cdc-base:2.3.0.
inlong-sort/sort-flink/cdc-base/src/main/java/org/apache/inlong/sort/cdc/base/source/assigner/state/PendingSplitsStateSerializer.java