## Issue Addressed N/A ## Proposed Changes Add lints for rust 1.71 [3789134](https://github.com/sigp/lighthouse/pull/4503/commits/3789134ae2b06cedbe8becf1db49b2d23689ef94) is probably the one that needs most attention as it changes beacon state code. I changed the `is_in_inactivity_leak ` function to return a `ArithError` as not all consumers of that function work well with a `BeaconState::Error`.