libp2p upgrade + gossipsub interval fix (#3012)

## Issue Addressed
Lighthouse gossiping late messages

## Proposed Changes
Point LH to our fork using tokio interval, which 1) works as expected 2) is more performant than the previous version that actually worked as expected
Upgrade libp2p 

## Additional Info
https://github.com/libp2p/rust-libp2p/issues/2497

beacon_node/lighthouse_network/src/lib.rs

@@ -67,7 +67,7 @@ pub use crate::types::{
     SubnetDiscovery,
 };
 
-pub use open_metrics_client;
+pub use prometheus_client;
 
 pub use behaviour::{BehaviourEvent, Gossipsub, PeerRequestId, Request, Response};
 pub use config::Config as NetworkConfig;