Bump lru from 0.7.8 to 0.8.0 (#6060)

* Bump lru from 0.7.8 to 0.8.0

Bumps [lru](https://github.com/jeromefroe/lru-rs) from 0.7.8 to 0.8.0.
- [Release notes](https://github.com/jeromefroe/lru-rs/releases)
- [Changelog](https://github.com/jeromefroe/lru-rs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/jeromefroe/lru-rs/compare/0.7.8...0.8.0)

---
updated-dependencies:
- dependency-name: lru
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

* Change `LruCache` paramerter to `NonZeroUsize`

* Change type of `session_cache_lru_size` to `NonZeroUsize`

* Add expects instead of unwrap

Co-authored-by: Bastian Köcher <info@kchr.de>

* Use match to get rid of expects

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Sebastian Kunert <skunert49@gmail.com>
Co-authored-by: Bastian Köcher <info@kchr.de>

polkadot/node/network/availability-recovery/src/lib.rs

@@ -20,6 +20,7 @@
 
 use std::{
 	collections::{HashMap, VecDeque},
+	num::NonZeroUsize,
 	pin::Pin,
 	time::Duration,
 };
@@ -77,7 +78,10 @@ const LOG_TARGET: &str = "parachain::availability-recovery";
 const N_PARALLEL: usize = 50;
 
 // Size of the LRU cache where we keep recovered data.
-const LRU_SIZE: usize = 16;
+const LRU_SIZE: NonZeroUsize = match NonZeroUsize::new(16) {
+	Some(cap) => cap,
+	None => panic!("Availability-recovery cache size must be non-zero."),
+};
 
 const COST_INVALID_REQUEST: Rep = Rep::CostMajor("Peer sent unparsable request");