Companion for: contracts: Expose environment types for offchain tooling (#3036)

* contracts: Add `Environment` config

* update lockfile for {"substrate", "polkadot"}

---------

Co-authored-by: parity-processbot <>

cumulus/parachains/runtimes/contracts/contracts-rococo/src/contracts.rs

@@ -62,4 +62,5 @@ impl Config for Runtime {
 		v15::Migration<Runtime>,
 	);
 	type RuntimeHoldReason = RuntimeHoldReason;
+	type Environment = ();
 }