chore: rustfmt fix + minor nits

Cargo.toml

@@ -26,4 +26,4 @@ winter_utils = { version = "0.4.1", package = "winter-utils", default-features =
 [dev-dependencies]
 proptest = "1.0.0"
 rand_utils = { version = "0.4", package = "winter-rand-utils" }
-criterion = "0.3"
+criterion = "0.4"

benches/hash.rs

@@ -1,11 +1,12 @@
-
-
 use criterion::{black_box, criterion_group, criterion_main, BatchSize, Criterion};
-use miden_crypto::{hash::{Hasher, Digest}, HashFn, Felt, ElementHasher};
+use miden_crypto::{
+    hash::{Digest, Hasher},
+    ElementHasher, Felt, HashFn,
+};
 use rand_utils::rand_value;
 
 fn rpo256_2to1(c: &mut Criterion) {
-    let v: [Digest; 2] = [Hasher::hash(&[1u8]), Hasher::hash(&[2u8])];
+    let v: [Digest; 2] = [Hasher::hash(&[1_u8]), Hasher::hash(&[2_u8])];
     c.bench_function("RPO256 2-to-1 hashing (cached)", |bench| {
         bench.iter(|| Hasher::merge(black_box(&v)))
     });
@@ -53,4 +54,4 @@ fn rpo256_sequential(c: &mut Criterion) {
 }
 
 criterion_group!(hash_group, rpo256_sequential, rpo256_2to1);
-criterion_main!(hash_group);
+criterion_main!(hash_group);