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/client/src/config.rs

@@ -5,7 +5,7 @@ use directory::DEFAULT_ROOT_DIR;
 use environment::LoggerConfig;
 use network::NetworkConfig;
 use sensitive_url::SensitiveUrl;
-use serde_derive::{Deserialize, Serialize};
+use serde::{Deserialize, Serialize};
 use std::fs;
 use std::path::PathBuf;
 use std::time::Duration;