Upgrade to OCamlformat 0.27.0 #29231

Job	Run time
Nix (macos-latest)	1m 56s
Build (macos-latest, 5.1.x)	13m 8s
Nix (ubuntu-latest)	57s
Build (ubuntu-latest, 5.1.x)	8m 43s
Coverage (5.1.x)	10m 4s
Coq 8.16.1	20s
Build (ocaml-variants.5.3.0+trunk, ubuntu-latest, true)	1m 52s
Documentation	1m 0s
Build (4.14.x, ubuntu-latest, true)	1m 27s
Format	24s
Wasm_of_ocaml	10m 18s
Build (4.14.x, macos-latest, true)	2m 9s
Build (5.1.x, macos-13, true)	3m 39s
Build (ocaml-base-compiler.4.14.2,system-msvc, windows-latest)	14m 28s
Build microbenchmarks	24s
Create local opam switch (macos-latest, 5)	5m 36s
Build (ocaml-base-compiler.5.1.1,system-mingw, windows-latest)	7m 58s
Create local opam switch (macos-latest, 4.14)	5m 54s
Build (4.08.x, ubuntu-latest, true)	1m 43s
Build monorepo benchmark docker image	3m 55s
Create local opam switch (ubuntu-latest, 5)	5m 9s
Build (4.04.x, ubuntu-latest, true, true)	4m 44s
Create local opam switch (ubuntu-latest, 4.14)	4m 49s
Build (4.02.x, ubuntu-latest, true)	3m 55s
	1h 54m 32s

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