[maintenance]: update CI to latest setup-ocaml to fix failure

Signed-off-by: Edwin Török <[email protected]>

Author: edwintorok

.github/workflows/ocaml-ci.yml

@@ -13,21 +13,27 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Pull configuration from xs-opam
         run: |
           curl --fail --silent https://raw.githubusercontent.com/xapi-project/xs-opam/master/tools/xs-opam-ci.env | cut -f2 -d " " > .env
 
       - name: Load environment file
         id: dotenv
-        uses: falti/dotenv-action@v0.2.4
+        uses: falti/dotenv-action@v1.1.4
 
       - name: Use ocaml
-        uses: avsm/setup-ocaml@v1
+        uses: avsm/setup-ocaml@v3
         with:
-          ocaml-version: ${{ steps.dotenv.outputs.ocaml_version_full }}
-          opam-repository: ${{ steps.dotenv.outputs.repository }}
+          ocaml-compiler: ${{ steps.dotenv.outputs.ocaml_version_full }}
+          opam-repositories: |
+            xs-opam: ${{ steps.dotenv.outputs.repository }}
+          dune-cache: true
+          opam-pin: false
+          cache-prefix: v3-${{ steps.system-info.outputs.name }}-${{ steps.system-info.outputs.release }}
+        env:
+          DUNE_CACHE_STORAGE_MODE: copy
 
       - name: Install dependencies
         run: |