Update ocaml/setup-ocaml to v3

.github/dependabot.yml

@@ -0,0 +1,8 @@
+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+    labels:
+      - no changelog

.github/workflows/emacs-lint.yml

@@ -25,10 +25,10 @@ jobs:
       EMACS_PACKAGE_LINT_IGNORE: ${{ matrix.package_lint_ignore }}
       EMACS_BYTECOMP_WARN_IGNORE: ${{ matrix.bytecomp_warn_ignore }}
     steps:
-    - uses: purcell/setup-emacs@master
+    - uses: purcell/setup-emacs@v6.0
       with:
         version: ${{ matrix.emacs_version }}
 
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Run tests
       run: 'cd emacs && ./check.sh'

.github/workflows/fuzzy-ci.yml

@@ -87,7 +87,7 @@ jobs:
           echo "version=$v" | tee -a $GITHUB_OUTPUT
 
       - name: Install OCaml
-        uses: ocaml/setup-ocaml@v2
+        uses: ocaml/setup-ocaml@v3
         with:
           ocaml-compiler: ${{ steps.compiler.outputs.version }}
           dune-cache: true
@@ -105,7 +105,7 @@ jobs:
           opam exec -- dune install -p merlin-lib,dot-merlin-reader,merlin
 
       - name: Pull irmin and its deps from cache if possible
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         id: irmin-cache
         with:
           path: irmin/
@@ -161,7 +161,7 @@ jobs:
         working-directory: irmin
 
       - name: Pull merl-an from cache if possible
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         id: merl-an-cache
         with:
           path: /usr/local/bin/merl-an
@@ -203,7 +203,7 @@ jobs:
         run: echo "name=$${{ matrix.commit }}_artifact_name" >> $GITHUB_OUTPUT
 
       - name: Upload data
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: ${{ steps.artifact_name.outputs.name }}
           path: ${{ env.data_dir }}
@@ -217,7 +217,7 @@ jobs:
 
       - name: Upload diff tool
         if: ${{ matrix.commit == 'merge_branch' }}
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: diff_tool
           path: create_diff
@@ -234,13 +234,13 @@ jobs:
       diff_dir: diff
     steps:
       - name: Download base branch data
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: ${{ env.BASE_BRANCH_ARTIFACT_NAME }}
           path: ${{ env.base_data_dir }}
 
       - name: Download merge branch data
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: ${{ env.MERGE_BRANCH_ARTIFACT_NAME }}
           path: ${{ env.merge_data_dir }}
@@ -249,7 +249,7 @@ jobs:
         run: mkdir -p "$diff_dir"
 
       - name: Download diff tool
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: diff_tool
 
@@ -293,7 +293,7 @@ jobs:
           | ./create_diff "--input-separator--" "--diff-cmd-separator--" "$diff_dir/$DISTILLED_DIFF_FILE"
 
       - name: Upload diff(s)
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: ${{ env.DIFF_ARTIFACT_NAME }}
           path: ${{ env.diff_dir }}
@@ -312,7 +312,7 @@ jobs:
 
       - name: Download current diff(s)
         if: ${{ env.current_diff_exists == 'true' }}
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: ${{ env.DIFF_ARTIFACT_NAME }}
 
@@ -370,7 +370,7 @@ jobs:
 
       - name: Upload instruction to delete label
         if: ${{ env.earlier_diff_was_approved == 'true' &&  steps.approved_diff.outputs.hash != steps.current_diff.outputs.hash }}
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: forwarded_instructions
           path: forward/
@@ -453,7 +453,7 @@ jobs:
 
       - name: Upload instruction to delete label
         if: ${{ steps.diff_metadata.outputs.exists == 'false' }}
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: forwarded_instructions
           path: forward/
@@ -498,7 +498,7 @@ jobs:
             '{instruction: $instruction, endpoint: $endpoint, artifacts_url: $artifacts_url, hash: $hash}' > ./forward/instruction.json
 
       - name: Upload instruction to comment on PR
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: forwarded_instructions
           path: forward/

.github/workflows/main.yml

@@ -55,13 +55,12 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Set-up OCaml ${{ matrix.ocaml-compiler }}
-        uses: ocaml/setup-ocaml@v2
+        uses: ocaml/setup-ocaml@v3
         with:
           ocaml-compiler: ${{ matrix.ocaml-compiler }}
 
       - name: Install dependencies
         run: |
-          opam depext conf-jq --yes # opam depext bug
           opam pin menhirLib 20201216 --no-action
           opam install --yes ppx_string ppx_compare
           opam install . --deps-only --with-test --yes

.github/workflows/nix.yml

@@ -27,11 +27,11 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         submodules: true
     - name: nix
-      uses: cachix/install-nix-action@v21
+      uses: cachix/install-nix-action@v27
       with:
         nix_path: nixpkgs=channel:nixos-unstable
     - run: nix develop -c dune build @check @runtest -p merlin-lib,dot-merlin-reader,merlin

.github/workflows/ocaml-lsp-compat.yml

@@ -41,17 +41,16 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set up OCaml ${{ matrix.ocaml-compiler }}
-        uses: ocaml/setup-ocaml@v2
+        uses: ocaml/setup-ocaml@v3
         with:
           # Version of the OCaml compiler to initialise
           ocaml-compiler: ${{ matrix.ocaml-compiler }}
 
       - name: Check that Merlin and OCaml-LSP are co-installable
         run: |
-          opam depext conf-jq # opam depext bug
           opam --cli=2.1 pin --with-version=dev --no-action https://github.com/voodoos/ocaml-lsp.git#5.2-preview
           opam --cli=2.1 pin --with-version=5.0-502 --no-action .
           opam install ocaml-lsp-server --with-test --ignore-constraints-on=ocamlformat