`memhash` is to be deleted in 1.13

[adienes]

CSV.jl/src/utils.jl

Line 581 in 04ec1cf

function Base.hash(s::PointerString, h::UInt)

this line defines hash on PointerString using memhash, which will be removed in 1.13

note that there are some in-progress plans to simplify the migration path but I just wanted to give advance warning