runtime: remove random_seed from BlockBuilder API (#2968)

* runtime: remove random_seed from BlockBuilder API

* update Substrate

* runtime: remove unused imports

* revert Cargo.lock version 3 removal, update sp-io

Co-authored-by: parity-processbot <>
Co-authored-by: Andronik Ordian <write@reusable.software>

polkadot/runtime/kusama/src/lib.rs

@@ -80,7 +80,7 @@ use sp_core::OpaqueMetadata;
 use sp_staking::SessionIndex;
 use frame_support::{
 	parameter_types, construct_runtime, RuntimeDebug, PalletId,
-	traits::{KeyOwnerProofSystem, Randomness, LockIdentifier, Filter, InstanceFilter, All},
+	traits::{KeyOwnerProofSystem, LockIdentifier, Filter, InstanceFilter, All},
 	weights::Weight,
 };
 use frame_system::{EnsureRoot, EnsureOneOf};
@@ -1364,10 +1364,6 @@ sp_api::impl_runtime_apis! {
 		) -> inherents::CheckInherentsResult {
 			data.check_extrinsics(&block)
 		}
-
-		fn random_seed() -> <Block as BlockT>::Hash {
-			pallet_babe::RandomnessFromOneEpochAgo::<Runtime>::random_seed().0
-		}
 	}
 
 	impl tx_pool_api::runtime_api::TaggedTransactionQueue<Block> for Runtime {