Prevent codept.0.11.1 from building with dune 3.13
Dune introduces stricter checking for opam package dependencies, thus `{` in
dependency descriptions is no longer valid. The issue has been fixed
upstream 2 years ago
https://github.com/Octachron/codept/commit/42f011e0a79c0ffa67bee738809c7be3981df537
and a newer, fixed version exists in opam-repository.
Example of failing build:
https://opam.ci.ocaml.org/github/ocaml/opam-repository/commit/fa3e075e57439140df4aacda519ec59df15e0b66/variant/compilers,4.14,dune-configurator.3.13.0~alpha1,revdeps,codept.0.11.1