RUSTSEC-2025-0031 Unsound public API in unmaintained crate

The following functions in the tantonengine crate are unsound due to lack of sufficient boundary checks in public API: - Stack::offset - ThreadStack::get - RootMoveList::insertscoredepth - RootMoveList::insertscore The tantonengine crate is no longer maintained, so there are no plans to fix this...