Compability with OCaml 5.0, bundles update, fix warnings
requested to merge tmartine/coccinelle:compatibility_with_ocaml_5_0-bundles_update-fix_warnings into master
This commit makes coccinelle compilable with OCaml 5.0. (Coccinelle should still compile with all previous versions of OCaml from 3.12.)
This commit updates pyml to the last released version (2022-09-06), for compatiblity with OCaml 5.0, and fixes the other bundles to remove the warnings.