fix: automatic Rust dependency update on pallas

'pallas-codec' '0.31' is not compatible with other pallas crates '0.30'.

Author: jpraynaud

Cargo.lock

@@ -50,7 +50,7 @@ kes-summed-ed25519 = { version = "0.2.1", features = [
 mithril-stm = { path = "../mithril-stm", version = "0.3", default-features = false }
 nom = "7.1.3"
 pallas-addresses = { version = "0.30.2", optional = true }
-pallas-codec = { version = "0.31.0", optional = true }
+pallas-codec = { version = "0.30.2", optional = true }
 pallas-hardano = { version = "0.30.2", optional = true }
 pallas-network = { version = "0.30.2", optional = true }
 pallas-primitives = { version = "0.30.2", optional = true }