The development dependency ppx_expect.v0.15.0 is incompatible with OCaml 5.

Expected Behavior

Running make dev-deps should install dev dependencies when OCaml 5 is installed.

Actual Behavior

Running make dev-deps with OCaml 5 installed will downgrade the compiler to version 4.something:

downgrade ocaml                       5.1.0 to 4.13.0

Alternatively if the switch invariant requires OCaml 5, the package ppx_expect.v0.15.0 will fail to install, as it depends on OCaml < 5.

Reproduction

1. Make an opam switch with OCaml 5
2. Run make dev-deps from the dune repo