Add pins of dune-project to Dyn representation (#11187) #287

Job	Run time
Build microbenchmarks	2m 32s
Coverage (5.1.x)	9m 46s
Coq 8.16.1	7m 15s
Build (macos-latest, 5.1.x)	14m 36s
Build (ubuntu-latest, 5.1.x)	8m 35s
Create local opam switch (macos-latest, 5)	5m 28s
Documentation	1m 1s
Build (ocaml-variants.5.3.0+trunk, ubuntu-latest, true)	1m 33s
Create local opam switch (macos-latest, 4.14)	6m 47s
Format	1m 7s
Build (4.14.x, ubuntu-latest, true)	1m 34s
Create local opam switch (ubuntu-latest, 5)	5m 28s
Build (4.14.x, macos-latest, true)	2m 41s
Build monorepo benchmark docker image	3m 43s
Create local opam switch (ubuntu-latest, 4.14)	4m 56s
Nix (macos-latest)	1m 55s
Build (5.1.x, macos-13, true)	6m 21s
Nix (ubuntu-latest)	57s
Build (ocaml-base-compiler.4.14.2,system-msvc, windows-latest)	14m 12s
Wasm_of_ocaml	10m 32s
Build (ocaml-base-compiler.5.1.1,system-mingw, windows-latest)	8m 9s
Build (4.08.x, ubuntu-latest, true)	1m 31s
Build (4.04.x, ubuntu-latest, true, true)	5m 7s
Build (4.02.x, ubuntu-latest, true)	3m 57s
	2h 9m 43s

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