Clippy lints for rust 1.66 (#3810)

## Issue Addressed
Fixes the new clippy lints for rust 1.66

## Proposed Changes

Most of the changes come from:
- [unnecessary_cast](https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast)
- [iter_kv_map](https://rust-lang.github.io/rust-clippy/master/index.html#iter_kv_map)
- [needless_borrow](https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow)

## Additional Info

na

consensus/state_processing/src/per_block_processing/altair/sync_committee.rs

@@ -52,10 +52,10 @@ pub fn process_sync_aggregate<T: EthSpec>(
         .zip(aggregate.sync_committee_bits.iter())
     {
         if participation_bit {
-            increase_balance(state, participant_index as usize, participant_reward)?;
+            increase_balance(state, participant_index, participant_reward)?;
             increase_balance(state, proposer_index as usize, proposer_reward)?;
         } else {
-            decrease_balance(state, participant_index as usize, participant_reward)?;
+            decrease_balance(state, participant_index, participant_reward)?;
         }
     }
 

consensus/state_processing/src/per_epoch_processing/altair/rewards_and_penalties.rs

@@ -76,7 +76,7 @@ pub fn get_flag_index_deltas<T: EthSpec>(
         let base_reward = get_base_reward(state, index, base_reward_per_increment, spec)?;
         let mut delta = Delta::default();
 
-        if unslashed_participating_indices.contains(index as usize)? {
+        if unslashed_participating_indices.contains(index)? {
             if !state.is_in_inactivity_leak(previous_epoch, spec) {
                 let reward_numerator = base_reward
                     .safe_mul(weight)?
@@ -89,8 +89,8 @@ pub fn get_flag_index_deltas<T: EthSpec>(
             delta.penalize(base_reward.safe_mul(weight)?.safe_div(WEIGHT_DENOMINATOR)?)?;
         }
         deltas
-            .get_mut(index as usize)
-            .ok_or(Error::DeltaOutOfBounds(index as usize))?
+            .get_mut(index)
+            .ok_or(Error::DeltaOutOfBounds(index))?
             .combine(delta)?;
     }
     Ok(())

consensus/state_processing/src/per_epoch_processing/base/rewards_and_penalties.rs

@@ -235,7 +235,7 @@ fn get_inclusion_delay_delta(
         let max_attester_reward = base_reward.safe_sub(proposer_reward)?;
         delta.reward(max_attester_reward.safe_div(inclusion_info.delay)?)?;
 
-        let proposer_index = inclusion_info.proposer_index as usize;
+        let proposer_index = inclusion_info.proposer_index;
         Ok((delta, Some((proposer_index, proposer_delta))))
     } else {
         Ok((Delta::default(), None))