Rust 1.89 compiler lint fix (#7644)

Fix lints for Rust 1.89 beta compiler

consensus/state_processing/src/consensus_context.rs

@@ -148,12 +148,12 @@ impl<E: EthSpec> ConsensusContext<E> {
     }
 
     #[allow(unknown_lints)]
-    #[allow(elided_named_lifetimes)]
+    #[allow(mismatched_lifetime_syntaxes)]
     pub fn get_indexed_attestation<'a>(
         &'a mut self,
         state: &BeaconState<E>,
         attestation: AttestationRef<'a, E>,
-    ) -> Result<IndexedAttestationRef<E>, BlockOperationError<AttestationInvalid>> {
+    ) -> Result<IndexedAttestationRef<'a, E>, BlockOperationError<AttestationInvalid>> {
         let key = attestation.tree_hash_root();
         match attestation {
             AttestationRef::Base(attn) => match self.indexed_attestations.entry(key) {

consensus/state_processing/src/per_block_processing/signature_sets.rs

@@ -56,7 +56,7 @@ impl From<BeaconStateError> for Error {
 pub fn get_pubkey_from_state<E>(
     state: &BeaconState<E>,
     validator_index: usize,
-) -> Option<Cow<PublicKey>>
+) -> Option<Cow<'_, PublicKey>>
 where
     E: EthSpec,
 {