[new release] conduit, conduit-mirage, conduit-lwt, conduit-lwt-unix and conduit-async (5.0.0)

[hannesm]

A network connection establishment library

• Project page: https://github.com/mirage/ocaml-conduit
• Documentation: https://mirage.github.io/ocaml-conduit/

CHANGES:

• change the type of Conduit_lwt_tls.X509.default_authenticator and
  Conduit_lwt_unix.default_ctx to be lazy, avoiding various side-effects
  (system interactions, logging) due to constructing these values at
  initialisation time. (@craigfe, Search for TLS trust anchors lazily mirage/ocaml-conduit#395 continue #395 -- fix compilation in case of tls.dummy is used mirage/ocaml-conduit#404)
• Adapt conduit-mirage to dns-client 6.0.0 API (adapt to dns 6.0.0 API changes mirage/ocaml-conduit#406 @hannesm)
• Use Lwt.pause instead of Lwt_unix.yield (Lwt_unix.yield was deprecated in favor of Lwt.pause mirage/ocaml-conduit#403 @MisterDA)
• Avoid deprecated Fmt.kstrf (avoid deprecated Fmt.kstrf, add fmt dependency to conduit-mirage mirage/ocaml-conduit#407 @hannesm)

[hannesm]

note: compilation failures that pop up in lower-bounds of cohttp-lwt-unix (re and cpp0) won't be fixed by this PR, which is already putting quite some pressure on the CI.

[hannesm]

ok, so from the CI I see that mirage/ocaml-conduit#395 (where @craigfe wrapped the trust anchors into a Lazy.t to fix mirage/ocaml-conduit#388) did some API breaking:

• cohttp-lwt-unix //cc @avsm
• aws-s3-lwt //cc @andersfugmann
• resp-unix //cc @zshipko

I added upper bounds for the three packages mentioned above, eventually the maintainers (mentioned) are interested to upgrade their packages.

[hannesm]

CI looks promising, as mentioned I added some upper bounds, and there are some lower bound failures (re and cpp0 fail to install; aws-s3-lwt needs some cmdliner lower bound). To lower the pressure on the CI (and since it is not related to the core of this PR) I won't fix any of that in this PR. This is fine to be merged.

[samoht]

Thanks!