Rust 1.89 compiler lint fix (#7644)

Fix lints for Rust 1.89 beta compiler

beacon_node/network/src/network_beacon_processor/gossip_methods.rs

@@ -67,7 +67,7 @@ struct VerifiedUnaggregate<T: BeaconChainTypes> {
 /// This implementation allows `Self` to be imported to fork choice and other functions on the
 /// `BeaconChain`.
 impl<T: BeaconChainTypes> VerifiedAttestation<T> for VerifiedUnaggregate<T> {
-    fn attestation(&self) -> AttestationRef<T::EthSpec> {
+    fn attestation(&self) -> AttestationRef<'_, T::EthSpec> {
         self.attestation.to_ref()
     }
 
@@ -100,7 +100,7 @@ struct VerifiedAggregate<T: BeaconChainTypes> {
 /// This implementation allows `Self` to be imported to fork choice and other functions on the
 /// `BeaconChain`.
 impl<T: BeaconChainTypes> VerifiedAttestation<T> for VerifiedAggregate<T> {
-    fn attestation(&self) -> AttestationRef<T::EthSpec> {
+    fn attestation(&self) -> AttestationRef<'_, T::EthSpec> {
         self.signed_aggregate.message().aggregate()
     }