Merge pull request ocaml#22790 from Leonidas-from-XIV/conan-ocaml-5-incompat

Conan does not work on OCaml 5

Author: kit-ty-kate

packages/conan-cli/conan-cli.0.0.2/opam

@@ -10,7 +10,7 @@ homepage: "https://github.com/mirage/conan"
 doc: "https://mirage.github.io/conan/"
 bug-reports: "https://github.com/mirage/conan/issues"
 depends: [
-  "ocaml"          {>= "4.08.0"}
+  "ocaml"          {>= "4.08.0" & < "5.0"}
   "conan"          {= version}
   "conan-database" {= version}
   "conan-unix"     {= version}

packages/conan/conan.0.0.2/opam

@@ -10,7 +10,7 @@ homepage: "https://github.com/mirage/conan"
 doc: "https://mirage.github.io/conan/"
 bug-reports: "https://github.com/mirage/conan/issues"
 depends: [
-  "ocaml"               {>= "4.08.0"}
+  "ocaml"               {>= "4.08.0" & < "5.0"}
   "re"                  {>= "1.9.0"}
   "dune"                {>= "2.9.0"}
   "uutf"