Merge pull request #24840 from ocaml/mseri-patch-4

ulex is not compatible with ocaml 5

Author: mseri

packages/ulex/ulex.1.2/opam

@@ -9,7 +9,7 @@ build: [
 install: [make "install"]
 remove: [["ocamlfind" "remove" "ulex"]]
 depends: [
-  "ocaml"
+  "ocaml" {< "5.0"}
   "base-bytes"
   "ocamlfind"
   "camlp4"