Fix workflow a bit

.github/workflows/workflow.yml

@@ -13,26 +13,21 @@ jobs:
 #          - macos-latest
           - ubuntu-latest
 #          - windows-latest
-        ocaml-version:
-          - 4.11.0
-          - 4.10.1
+        ocaml-compiler:
+          - "5.1"
 
     runs-on: ${{ matrix.os }}
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
-      - name: Use OCaml ${{ matrix.ocaml-version }}
-        uses: avsm/setup-ocaml@v1
+      - name: Use OCaml ${{ matrix.ocaml-compiler }}
+        uses: ocaml/setup-ocaml@v2
         with:
-          ocaml-version: ${{ matrix.ocaml-version }}
+          ocaml-compiler: ${{ matrix.ocaml-compiler }}
 
-      - run: opam pin add c4f.dev . --no-action
-
-      - run: opam depext c4f --yes --with-doc --with-test
-
-      - run: opam install . --deps-only --with-doc --with-test
+      - run: opam install . --deps-only --with-test
 
       - run: opam exec -- dune build
 
@@ -41,5 +36,5 @@ jobs:
 #      - name: Upload the build artifact
 #        uses: actions/upload-artifact@v2
 #        with:
-#          name: ${{ matrix.os }}-${{ matrix.ocaml-version }}-world.exe
+#          name: ${{ matrix.os }}-${{ matrix.ocaml-compiler }}-world.exe
 #          path: _build/default/world.exe