3.19.1 release tracker

[maiste]

Preparation

• need backport:
  • https://github.com/ocaml/dune/pull/11879
• backports:
  • https://github.com/ocaml/dune/pull/11896

Release

• [x] prepare changelog https://github.com/ocaml/dune/pull/11897
• [x] release 3.19.1 on opam https://github.com/ocaml/opam-repository/pull/28017
• [x] triage

Post Release

• [x] upgrade version in nix-overlays https://github.com/nix-ocaml/nix-overlays/pull/2049
• [x] merge changelog in main https://github.com/ocaml/dune/pull/11899
• [ ] add an entry in ocaml.org data/changelog/dune https://github.com/ocaml/ocaml.org/pull/3164
• [ ] add a post on ocaml discuss https://discuss.ocaml.org/t/ann-dune-3-19/16693/2?u=maiste