Bump ethabi-derive from 11.0.0 to 12.0.0 (paritytech#81)

Author: dependabot-preview[bot]

bridges/relays/ethereum/Cargo.toml

@@ -13,7 +13,7 @@ codec = { package = "parity-scale-codec", version = "1.0.0" }
 env_logger = "0.7.0"
 ethabi = "12.0"
 ethabi-contract = "11.0"
-ethabi-derive = "11.0"
+ethabi-derive = "12.0"
 ethereum-tx-sign = { git = "https://github.com/svyatonik/ethereum-tx-sign.git", branch = "up-ethereum-types" }
 futures = "0.3.1"
 hex = "0.4"