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

slasher/src/database.rs

@@ -665,7 +665,7 @@ impl<E: EthSpec> SlasherDB<E> {
         target: Epoch,
         prev_max_target: Option<Epoch>,
     ) -> Result<Option<CompactAttesterRecord>, Error> {
-        if prev_max_target.map_or(true, |prev_max| target > prev_max) {
+        if prev_max_target.is_none_or(|prev_max| target > prev_max) {
             return Ok(None);
         }