ocamlPackages.conduit, cohttp: → 3.0.0

[sternenseemann]

Motivation for this change

Changelogs:

• https://github.com/mirage/ocaml-cohttp/releases/tag/v3.0.0
• 3.0.0 mirage/ocaml-conduit#311, https://github.com/mirage/ocaml-conduit/releases/tag/v3.0.0

conduit 3.0.0 brings a few breaking API changes. So far it seems there is only really an updated cohttp version for these changes, so merging these updates depends on other packages being updated to reflect the API changes.

Since nothing seems to depend on conduit or cohttp >= 3.0.0 exclusively there also seems to be no rush or the necessity to have two versions in nixpkgs.

Currently the following packages would be broken by this PR:

• dune-release
• ocamlPackages.curly
• ocamlPackages.git-http, ocamlPackages.git-unix, ocamlPackages.irmin-git, ocamlPackages.irmin-http, ocamlPackages.irmin-unix
• ocamlPackages.opium
• ocamlPackages.prof_spacetime

To do:

• cohttp-top
• cohttp-mirage
• cohttp-lwt-jsoo
• conduit-mirage

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

[sternenseemann]

the OCaml ecosystem has moved past these versions, they were never properly released and changes to conduit have been reverted since.

see #118144