Companion for https://github.com/paritytech/polkadot/pull/7341 (#2726)

* Companion to enabling past session slashing on production.

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

---------

Co-authored-by: eskimor <eskimor@no-such-url.com>
Co-authored-by: parity-processbot <>

cumulus/client/relay-chain-minimal-node/src/blockchain_rpc_client.rs

@@ -21,7 +21,7 @@ use cumulus_relay_chain_rpc_interface::RelayChainRpcClient;
 use futures::{Stream, StreamExt};
 use polkadot_core_primitives::{Block, BlockNumber, Hash, Header};
 use polkadot_overseer::RuntimeApiSubsystemClient;
-use polkadot_primitives::vstaging;
+use polkadot_primitives::slashing;
 use sc_authority_discovery::{AuthorityDiscovery, Error as AuthorityDiscoveryError};
 use sp_api::{ApiError, RuntimeApiInfo};
 
@@ -308,7 +308,7 @@ impl RuntimeApiSubsystemClient for BlockChainRpcClient {
 		Vec<(
 			polkadot_primitives::SessionIndex,
 			polkadot_primitives::CandidateHash,
-			vstaging::slashing::PendingSlashes,
+			slashing::PendingSlashes,
 		)>,
 		ApiError,
 	> {
@@ -319,15 +319,15 @@ impl RuntimeApiSubsystemClient for BlockChainRpcClient {
 		&self,
 		at: Hash,
 		validator_id: polkadot_primitives::ValidatorId,
-	) -> Result<Option<vstaging::slashing::OpaqueKeyOwnershipProof>, ApiError> {
+	) -> Result<Option<slashing::OpaqueKeyOwnershipProof>, ApiError> {
 		Ok(self.rpc_client.parachain_host_key_ownership_proof(at, validator_id).await?)
 	}
 
 	async fn submit_report_dispute_lost(
 		&self,
 		at: Hash,
-		dispute_proof: vstaging::slashing::DisputeProof,
-		key_ownership_proof: vstaging::slashing::OpaqueKeyOwnershipProof,
+		dispute_proof: slashing::DisputeProof,
+		key_ownership_proof: slashing::OpaqueKeyOwnershipProof,
 	) -> Result<Option<()>, ApiError> {
 		Ok(self
 			.rpc_client