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>

beacon_node/lighthouse_network/src/config.rs

@@ -8,7 +8,7 @@ use directory::{
 use discv5::{Discv5Config, Discv5ConfigBuilder};
 use libp2p::gossipsub;
 use libp2p::Multiaddr;
-use serde_derive::{Deserialize, Serialize};
+use serde::{Deserialize, Serialize};
 use sha2::{Digest, Sha256};
 use std::net::{Ipv4Addr, Ipv6Addr};
 use std::num::NonZeroU16;