Include setup-ocaml version in cache key

Author: cknitt

.github/workflows/ci.yml

@@ -75,6 +75,9 @@ jobs:
 
  runs-on: ${{matrix.os}}
 
+ env:
+ SETUP_OCAML_VERSION: 3.3.5 # also adjust in `uses:` if changed!
+
  steps:
  - name: "Windows: Set git config"
  if: runner.os == 'Windows'
@@ -141,7 +144,7 @@ jobs:
  # matrix.ocaml_compiler may contain commas
  - name: Get OPAM cache key
  shell: bash
- run: echo "opam_cache_key=opam-env-v8-${{ matrix.os }}-${{ matrix.ocaml_compiler }}-${{ hashFiles('*.opam') }}" | sed 's/,/-/g' >> $GITHUB_ENV
+ run: echo "opam_cache_key=opam-env-v8-${{ matrix.os }}-${{ env.SETUP_OCAML_VERSION }}-{{ matrix.ocaml_compiler }}-${{ hashFiles('*.opam') }}" | sed 's/,/-/g' >> $GITHUB_ENV
 
  - name: Restore OPAM environment
  id: cache-opam-env
@@ -157,7 +160,7 @@ jobs:
  key: ${{ env.opam_cache_key }}
 
  - name: Use OCaml ${{matrix.ocaml_compiler}}
- uses: ocaml/setup-ocaml@v3.3.2
+ uses: ocaml/setup-ocaml@v3.3.5
  if: steps.cache-opam-env.outputs.cache-hit != 'true'
  with:
  ocaml-compiler: ${{matrix.ocaml_compiler}}