Give up on ocamlformat in CI

.github/workflows/build.yml

@@ -39,7 +39,7 @@ jobs:
         uses: avsm/setup-ocaml@v1
         with:
           # Version of the OCaml compiler to initialise
-          ocaml-version: 4.12.0
+          ocaml-version: 4.11.0
 
       - name: Install dependencies
         run: |

CONTRIBUTING.md

@@ -92,6 +92,9 @@ You can look at the
 [online OCaml documentation](https://catala-lang.org/ocaml_docs/) for the
 different modules' interfaces as well as high-level architecture documentation.
 
+Please note that the `ocamlformat` version the this project use is `0.17.0`.
+Using another version may cause spurious diffs to appear in your pull requests.
+
 ## Internationalization
 
 The Catala language should be adapted to any legislative text that follows a

Makefile

@@ -15,7 +15,7 @@ dependencies-ocaml:
 		ocamlformat ANSITerminal sedlex	menhir menhirLib dune cmdliner obelisk \
 		re obelisk unionfind bindlib zarith zarith_stubs_js ocamlgraph \
 		js_of_ocaml-compiler js_of_ocaml js_of_ocaml-ppx calendar camomile \
-		visitors benchmark ocamlformat=0.17.0
+		visitors benchmark ocamlformat
 
 init-submodules:
 	git submodule update --init