Update parity-scale-codec to prepare for breaking rustc release (#6746)

This updates parity-scale-codec{-derive} to prepare for a rustc release
that would otherwise break the derive implementation:
https://github.com/rust-lang/rust/pull/73084

substrate/client/db/Cargo.toml

@@ -20,7 +20,7 @@ kvdb-memorydb = "0.7.0"
 linked-hash-map = "0.5.2"
 hash-db = "0.15.2"
 parity-util-mem = { version = "0.7.0", default-features = false, features = ["std"] }
-codec = { package = "parity-scale-codec", version = "1.3.1", features = ["derive"] }
+codec = { package = "parity-scale-codec", version = "1.3.4", features = ["derive"] }
 blake2-rfc = "0.2.18"
 
 sc-client-api = { version = "2.0.0-rc5", path = "../api" }