serial: Use versioned darkfi-derive crate.

src/serial/Cargo.toml

@@ -9,7 +9,7 @@ license = "AGPL-3.0-only"
 edition = "2021"
 
 [dependencies]
-darkfi-derive = {path = "./derive", optional = true}
+darkfi-derive = {version = "0.3.0", path = "./derive", optional = true}
 futures-lite = {version = "1.12.0", optional = true}
 
 # Supported types for encoding