starknet_patricia: derive Serialize and Deserialize for SubTreeHeight

Author: itamar-starkware

crates/starknet_patricia/src/patricia_merkle_tree/types.rs

@@ -9,8 +9,18 @@ use crate::patricia_merkle_tree::node_data::inner_node::{EdgePathLength, PathToB
 #[path = "types_test.rs"]
 pub mod types_test;
 
-#[cfg_attr(feature = "deserialize", derive(serde::Deserialize))]
-#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq, derive_more::Sub, derive_more::Display)]
+#[derive(
+    Clone,
+    Copy,
+    Debug,
+    Eq,
+    Hash,
+    PartialEq,
+    serde::Deserialize,
+    serde::Serialize,
+    derive_more::Sub,
+    derive_more::Display,
+)]
 pub struct SubTreeHeight(pub u8);
 
 impl SubTreeHeight {