Rust 1.85 lints (#7019)

N/A


  2 changes:
1. Replace Option::map_or(true, ...) with is_none_or(...)
2. Remove unnecessary `Into::into` blocks where the type conversion is apparent from the types

beacon_node/operation_pool/src/reward_cache.rs

@@ -83,7 +83,7 @@ impl RewardCache {
         if self
             .initialization
             .as_ref()
-            .map_or(true, |init| *init != new_init)
+            .is_none_or(|init| *init != new_init)
         {
             self.update_previous_epoch_participation(state)
                 .map_err(OpPoolError::RewardCacheUpdatePrevEpoch)?;