remove no longer required #[allow(clippy::mutable_key_type)] (#6210)

* remove no longer required clippy::mutable_key_type lint

beacon_node/lighthouse_network/src/lib.rs

@@ -5,7 +5,6 @@
 mod config;
 pub mod service;
 
-#[allow(clippy::mutable_key_type)] // PeerId in hashmaps are no longer permitted by clippy
 pub mod discovery;
 pub mod listen_addr;
 pub mod metrics;

beacon_node/lighthouse_network/src/peer_manager/mod.rs

@@ -23,7 +23,6 @@ use types::{EthSpec, SyncSubnetId};
 pub use libp2p::core::Multiaddr;
 pub use libp2p::identity::Keypair;
 
-#[allow(clippy::mutable_key_type)] // PeerId in hashmaps are no longer permitted by clippy
 pub mod peerdb;
 
 use crate::peer_manager::peerdb::client::ClientKind;
@@ -320,7 +319,6 @@ impl<E: EthSpec> PeerManager<E> {
     /// returned here.
     ///
     /// This function decides whether or not to dial these peers.
-    #[allow(clippy::mutable_key_type)]
     pub fn peers_discovered(&mut self, results: HashMap<Enr, Option<Instant>>) {
         let mut to_dial_peers = 0;
         let connected_or_dialing = self.network_globals.connected_or_dialing_peers();