Merge pull request #28330 from jmid/mutaml-ppxlib-bound

Set a ppxlib upper bound for mutaml

Author: dinosaure

packages/mutaml/mutaml.0.3/opam

@@ -19,6 +19,7 @@ depends: [
   "dune" {>= "3.0"}
   "ocaml" {>= "4.12.0"}
   "ppxlib" {>= "0.28.0"}
+  "ppxlib" {with-test & <= "0.33.0"}
   "ppx_yojson_conv" {>= "v0.14.0"}
   "stdlib-random"
   "conf-timeout"