Fix cache reuse safety in non-allocating finite_difference_jacobian#214

ChrisRackauckas merged 2 commits intoJuliaDiff:masterJuliaDiff/FiniteDiff.jl:masterfrom

ChrisRackauckas-Claude:fix-cache-updatesChrisRackauckas-Claude/FiniteDiff.jl:fix-cache-updatesCopy head branch name to clipboard