Upgrade to OCaml 5.3#1

Open

sheruost wants to merge 2 commits intofmlab-iis:masterfrom

sheruost:master

Commits on Mar 6, 2025

Replace Pervasives with Stdlib due to deprecation of the module in OCaml > 4.07.
sheruost
committed
the ocaml source code can now be compiled with OCaml 5.3
sheruost
committed