Fix Rust 1.69 lints (#4222)

## Issue Addressed

N/A

## Proposed Changes

Fixes lints mostly `extra-unused-type-parameters` https://rust-lang.github.io/rust-clippy/master/index.html#extra_unused_type_paramete

beacon_node/execution_layer/src/engine_api/http.rs

@@ -1187,7 +1187,7 @@ mod test {
             transactions,
             ..<_>::default()
         });
-        let json = serde_json::to_value(&ep)?;
+        let json = serde_json::to_value(ep)?;
         Ok(json.get("transactions").unwrap().clone())
     }