companion for polkadot#4545 (session-info v2) (#875)

* companion for https://github.com/paritytech/polkadot/pull/4545

* update lockfile for polkadot

Co-authored-by: parity-processbot <>

cumulus/client/relay-chain-local/src/lib.rs

@@ -19,10 +19,8 @@ use std::{sync::Arc, time::Duration};
 use async_trait::async_trait;
 use cumulus_primitives_core::{
 	relay_chain::{
-		v1::{
-			CommittedCandidateReceipt, OccupiedCoreAssumption, ParachainHost, SessionIndex,
-			ValidatorId,
-		},
+		v1::{CommittedCandidateReceipt, OccupiedCoreAssumption, SessionIndex, ValidatorId},
+		v2::ParachainHost,
 		Block as PBlock, BlockId, Hash as PHash, InboundHrmpMessage,
 	},
 	InboundDownwardMessage, ParaId, PersistedValidationData,

cumulus/primitives/core/src/lib.rs

@@ -34,7 +34,7 @@ pub use polkadot_primitives::v1::{
 /// A module that re-exports relevant relay chain definitions.
 pub mod relay_chain {
 	pub use polkadot_core_primitives::*;
-	pub use polkadot_primitives::{v1, v1::well_known_keys};
+	pub use polkadot_primitives::{v1, v1::well_known_keys, v2};
 }
 
 /// An inbound HRMP message.