Merge pull request #23854 from mseri/fix-mparser

mparser 1.2.1 is not compatible with ocaml 5.0

Author: mseri

packages/mparser/mparser.1.2.1/opam

@@ -6,7 +6,7 @@ license: "LGPL-2.1-only WITH OCaml-LGPL-linking-exception"
 dev-repo: "git://https://github.com/cakeplus/mparser"
 bug-reports: "https://github.com/cakeplus/mparser/issues"
 depends: [
-  "ocaml"
+  "ocaml" {< "5.0"}
   "base-bytes"
   "ocamlfind" {build}
   "ocamlbuild" {build}