Update CheckPointSerializer.java

Author: skippy-404

spring-ai-alibaba-graph-core/src/main/java/com/alibaba/cloud/ai/graph/serializer/check_point/CheckPointSerializer.java

@@ -44,11 +44,11 @@ public void write(Checkpoint object, ObjectOutput out) throws IOException {
 	@Override
 	public Checkpoint read(ObjectInput in) throws IOException, ClassNotFoundException {
 		return Checkpoint.builder()
-				.id(in.readUTF())
-				.nodeId(readNullableUTF(in).orElse(null))
-				.nextNodeId(readNullableUTF(in).orElse(null))
-				.state((OverAllState) stateSerializer.read(in))
-				.build();
+			.id(in.readUTF())
+			.nodeId(readNullableUTF(in).orElse(null))
+			.nextNodeId(readNullableUTF(in).orElse(null))
+			.state((OverAllState) stateSerializer.read(in))
+			.build();
 	}
 
 }