The upstream OCaml PR was merged - please could someone kick GitHub actions?

Re-running the analysis step to pickup dune 3.3.0 so this works on OCaml 5.0. Otherwise ocaml-ci should be working for this PR. @dra27

I just kicked GitHub Actions.

The tests require a release of base with janestreet/base#129 (comment) addressed, although temporarily pinning it also revealed a missing symbol shim.

With dra27@9d4f2b5b4, this passed ocaml-ci on 5.0

Tested locally.

It just needs an entry in CHANGES. I'll push a commit for that.

Additionally, we could also add a check for 5.0.0~alpha0 in the CI. We currently already have 4.12+domains and 4.14+domains. Any reason not to do that? There's the fact that we'll want to modify it as the different alphas come in and then as 5.0.0 (non-alpha) is released. But the plus side is we can make sure that further PRs don't break anything.
I'm pushing a commit to that end. Let me know if you are ok with it.

The ci is somewhat finicky because it's an alpha release. I'm merging this now and may address the CI later.

I wholeheartedly back adding 5.0 testing to CI 🙂