Remove serde derive references (#4830)

* remove remaining uses of serde_derive

* fix lockfile

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

consensus/proto_array/src/proto_array.rs

@@ -1,6 +1,6 @@
 use crate::error::InvalidBestNodeInfo;
 use crate::{error::Error, Block, ExecutionStatus, JustifiedBalances};
-use serde_derive::{Deserialize, Serialize};
+use serde::{Deserialize, Serialize};
 use ssz::four_byte_option_impl;
 use ssz::Encode;
 use ssz_derive::{Decode, Encode};