Investigate flakiness with `cmdliner 2` installed through opam.

[spotandjake]

It seems some of our tests are flaking when installing cmdliner 2.0 through opam on windows this is a downstream dependency of js_of_ocaml.

I've noticed it seems to behave worse when were doing a lot of installs at once vs when we run them indivually it seems to flake less often.

We could restrict to cmdliner < 2.0.0 which would go back to using 1.3.0 we previously used however it would be nice to keep our restrictions open on libbinaryen and binaryen.ml

[spotandjake]

Once #90 is merged we won't have the option of restricting libbinaryen.