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

common/validator_dir/src/builder.rs

@@ -196,7 +196,7 @@ impl<'a> Builder<'a> {
                 if path.exists() {
                     return Err(Error::DepositDataAlreadyExists(path));
                 } else {
-                    let hex = format!("0x{}", hex::encode(&deposit_data));
+                    let hex = format!("0x{}", hex::encode(deposit_data));
                     File::options()
                         .write(true)
                         .read(true)