contracts: Update to wasmi 0.31 (paritytech#1350)

* contracts: Update to wasmi 0.31

* ".git/.scripts/commands/bench/bench.sh" --subcommand=pallet --runtime=dev --target_dir=substrate --pallet=pallet_contracts

---------

Co-authored-by: command-bot <>

Author: athei

substrate/frame/contracts/Cargo.toml

@@ -26,7 +26,7 @@ serde = { version = "1", optional = true, features = ["derive"] }
 smallvec = { version = "1", default-features = false, features = [
 	"const_generics",
 ] }
-wasmi = { version = "0.30", default-features = false }
+wasmi = { version = "0.31", default-features = false }
 impl-trait-for-tuples = "0.2"
 
 # Only used in benchmarking to generate contract code