Bump futures from 0.3.9 to 0.3.12 (#655)

bridges/relays/ethereum/Cargo.toml

@@ -15,7 +15,7 @@ env_logger = "0.8.2"
 ethabi = "13.0"
 ethabi-contract = "11.0"
 ethabi-derive = "13.0"
-futures = "0.3.8"
+futures = "0.3.12"
 hex = "0.4"
 hex-literal = "0.3"
 libsecp256k1 = { version = "0.3.4", default-features = false, features = ["hmac"] }

bridges/relays/substrate/Cargo.toml

@@ -9,7 +9,7 @@ license = "GPL-3.0-or-later WITH Classpath-exception-2.0"
 async-std = "1.9.0"
 async-trait = "0.1.42"
 codec = { package = "parity-scale-codec", version = "1.3.4" }
-futures = "0.3.8"
+futures = "0.3.12"
 hex = "0.4"
 log = "0.4.11"
 num-traits = "0.2"