Update serde to 1.0.103

Author: ldm0

Cargo.toml

@@ -18,7 +18,7 @@ foldhash = { version = "0.1.2", default-features = false, optional = true }
 
 # For external trait impls
 rayon = { version = "1.3", optional = true }
-serde = { version = "1.0.25", default-features = false, optional = true }
+serde = { version = "1.0.103", default-features = false, optional = true }
 
 # When built as part of libstd
 core = { version = "1.0.0", optional = true, package = "rustc-std-workspace-core" }