chore: remove unused imports

Author: iosh

crates/dbs/storage/src/storage_db/snapshot_db.rs

@@ -226,7 +226,6 @@ use derivative::Derivative;
 use malloc_size_of_derive::MallocSizeOf as DeriveMallocSizeOf;
 use primitives::{EpochId, MerkleHash, MERKLE_NULL_NODE, NULL_EPOCH};
 use rlp::{Decodable, DecoderError, Encodable, Rlp, RlpStream};
-use rlp_derive::{RlpDecodable, RlpEncodable};
 use serde_utils::rlp_decode_bool_compat;
 use std::{path::Path, sync::Arc};
 use tokio::sync::Semaphore;