Removed an old use

Author: jclapis

crates/common/src/commit/request.rs

@@ -8,7 +8,6 @@ use alloy::{
     hex,
     primitives::{aliases::B32, Address, B256},
     rpc::types::beacon::BlsSignature,
-    signers::k256::U256,
 };
 use serde::{Deserialize, Deserializer, Serialize};
 use tree_hash::TreeHash;