Update Rust crate serde to 1.0.229

Author: oxide-renovate[bot]

Cargo.toml

@@ -14,6 +14,6 @@ syn = { version = "2", features = ["extra-traits", "derive"] }
 
 [dev-dependencies]
 rustversion = "1.0.20"
-serde = { version = "1.0.219", features = ["derive"] }
+serde = { version = "1.0.229", features = ["derive"] }
 serde_json = "1.0.140"
 trybuild = "1.0.104"