script/ping: fix darkfi-serial dependency

script/ping/Cargo.toml

@@ -10,7 +10,7 @@ edition = "2021"
 
 [dependencies]
 darkfi = {path = "../../", features = ["net"]}
-darkfi-serial = {path = "../../src/serial"}
+darkfi-serial = {version = "0.4.2"}
 url = {version = "2.5.2", features = ["serde"]}
 smol = "2.0.2"