Ignore clippy range_plus_one lints

eth2/utils/cached_tree_hash/src/resize.rs

@@ -1,3 +1,5 @@
+#![allow(clippy::range_plus_one)] // Minor readability lint requiring structural changes; not worth it.
+
 use super::*;
 
 /// New vec is bigger than old vec.

eth2/utils/cached_tree_hash/src/tree_hash_cache.rs

@@ -1,3 +1,5 @@
+#![allow(clippy::range_plus_one)] // Minor readability lint requiring structural changes; not worth it.
+
 use super::*;
 use crate::merkleize::{merkleize, pad_for_leaf_count};
 use int_to_bytes::int_to_bytes32;