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/beacon_chain/src/shuffling_cache.rs

@@ -138,7 +138,7 @@ impl ShufflingCache {
             .get(&key)
             // Replace the committee if it's not present or if it's a promise. A bird in the hand is
             // worth two in the promise-bush!
-            .map_or(true, CacheItem::is_promise)
+            .is_none_or(CacheItem::is_promise)
         {
             self.insert_cache_item(
                 key,