3.16.1 release tracking

[maiste]

Preparation

• need backport:
  • Call the C++ compiler with -std=c++11 when using OCaml >= 5.0 #10962
  • Fix the compilation of OCaml 5 programs on Cygwin #11009
• backport:
  • [3.16] backport: #11009 #10962 #11051
• restrict pp version < 2.0 c749037

Release

• prepare chore: prepare 3.16.1 #11055
• release 3.16.1 on opam [new release] dune (15 packages) (3.16.1) opam-repository#26816
• triage

Post-release

• upgrade version in nix-overlay? Maybe not needed (dune.3.16.1 and update the overlay nix-ocaml/nix-overlays#1731)
• merge changelog in main chore: merge 3.16.1 changelog #11056
• add an entry in ocaml.org data/changelog/dune chore: changelog for dune 3.16.1 ocaml.org#2798
• make a post on discuss (https://discuss.ocaml.org/t/ann-dune-3-16/14889/2?u=maiste=