Move dependencies to workspace (#4650)

## Issue Addressed

Synchronize dependencies and edition on the workspace `Cargo.toml`

## Proposed Changes

with https://github.com/rust-lang/cargo/issues/8415 merged it's now possible to synchronize details on the workspace `Cargo.toml` like the metadata and dependencies.
By only having dependencies that are shared between multiple crates aligned on the workspace `Cargo.toml` it's easier to not miss duplicate versions of the same dependency and therefore ease on the compile times.

## Additional Info
this PR also removes the no longer required direct dependency of the `serde_derive` crate.

should be reviewed after https://github.com/sigp/lighthouse/pull/4639 get's merged.
closes https://github.com/sigp/lighthouse/issues/4651


Co-authored-by: Michael Sproul <michael@sigmaprime.io>
Co-authored-by: Michael Sproul <micsproul@gmail.com>

beacon_node/lighthouse_network/src/peer_manager/mod.rs

@@ -2197,7 +2197,7 @@ mod tests {
         }
 
         impl Arbitrary for PeerCondition {
-            fn arbitrary<G: Gen>(g: &mut G) -> Self {
+            fn arbitrary(g: &mut Gen) -> Self {
                 let attestation_net_bitfield = {
                     let len = <E as EthSpec>::SubnetBitfieldLength::to_usize();
                     let mut bitfield = Vec::with_capacity(len);