update dune to 3.11.1 (#1108) #3646

Job	Run time
Native packages (macOS, OCaml 4_14)	2h 2m 55s
Native packages (Linux, OCaml 4_14)	2h 30m 31s
Native packages (macOS, OCaml 5_0)	2h 10m 2s
nix-fmt-check	1m 34s
Native packages (Linux, OCaml 5_0)	1h 42m 47s
arm64 packages (OCaml 4_14)	1m 17s
Native packages (macOS, OCaml 5_1)	1h 13m 41s
Native packages (Linux, OCaml 5_1)	1h 41m 18s
musl packages (OCaml 4_14)	1m 46s
arm64 packages (OCaml 5_0)	1m 34s
musl packages (OCaml 5_0)	1m 16s
Native (Top-level) packages (ubuntu-latest)	1m 16s
arm64 packages (OCaml 5_1)	1m 25s
Native (Top-level) packages (macos-13)	2m 6s
musl packages (OCaml 5_1)	1m 18s
	11h 34m 46s

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