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) {