Remove serde derive references (#4830)

* remove remaining uses of serde_derive

* fix lockfile

---------

Co-authored-by: João Oliveira <hello@jxs.pt>

slasher/Cargo.toml

@@ -23,7 +23,6 @@ parking_lot = { workspace = true }
 rand = { workspace = true }
 safe_arith = { workspace = true }
 serde = { workspace = true }
-serde_derive = "1.0"
 slog = { workspace = true }
 sloggers = { workspace = true }
 tree_hash = { workspace = true }

slasher/src/array.rs

@@ -4,7 +4,7 @@ use crate::{
     SlasherDB,
 };
 use flate2::bufread::{ZlibDecoder, ZlibEncoder};
-use serde_derive::{Deserialize, Serialize};
+use serde::{Deserialize, Serialize};
 use std::borrow::Borrow;
 use std::collections::{btree_map::Entry, BTreeMap, HashSet};
 use std::convert::TryFrom;

slasher/src/config.rs

@@ -1,5 +1,5 @@
 use crate::Error;
-use serde_derive::{Deserialize, Serialize};
+use serde::{Deserialize, Serialize};
 use std::path::PathBuf;
 use strum::{Display, EnumString, EnumVariantNames};
 use types::{Epoch, EthSpec, IndexedAttestation};