GHSA-P75V-367R-2V23 `cell-project` used incorrect variance when projecting through `&Cell<T>`

Overview The issue lies in the implementation of the cellproject macro which used field as const instead of field as mut . The problem being that const T is covariant in T while mut T is invariant in T. Keep in mind that &Cell is invariant in T, so casting to const T relaxed the variance, and lea...