deps: replace lru with schnellru (#1217)

* deps: replace lru with schnellru

* bring the peace to the galaxy

polkadot/node/network/dispute-distribution/src/lib.rs

@@ -24,7 +24,7 @@
 //! The sender is responsible for getting our vote out, see [`sender`]. The receiver handles
 //! incoming [`DisputeRequest`]s and offers spam protection, see [`receiver`].
 
-use std::{num::NonZeroUsize, time::Duration};
+use std::time::Duration;
 
 use futures::{channel::mpsc, FutureExt, StreamExt, TryFutureExt};
 
@@ -165,8 +165,7 @@ where
 	) -> Self {
 		let runtime = RuntimeInfo::new_with_config(runtime::Config {
 			keystore: Some(keystore),
-			session_cache_lru_size: NonZeroUsize::new(DISPUTE_WINDOW.get() as usize)
-				.expect("Dispute window can not be 0; qed"),
+			session_cache_lru_size: DISPUTE_WINDOW.get(),
 		});
 		let (tx, sender_rx) = NestingSender::new_root(1);
 		let disputes_sender = DisputeSender::new(tx, metrics.clone());

polkadot/node/network/dispute-distribution/src/receiver/mod.rs

@@ -15,7 +15,6 @@
 // along with Polkadot.  If not, see <http://www.gnu.org/licenses/>.
 
 use std::{
-	num::NonZeroUsize,
 	pin::Pin,
 	task::{Context, Poll},
 	time::Duration,
@@ -161,8 +160,7 @@ where
 	) -> Self {
 		let runtime = RuntimeInfo::new_with_config(runtime::Config {
 			keystore: None,
-			session_cache_lru_size: NonZeroUsize::new(DISPUTE_WINDOW.get() as usize)
-				.expect("Dispute window can not be 0; qed"),
+			session_cache_lru_size: DISPUTE_WINDOW.get(),
 		});
 		Self {
 			runtime,