update node.js

Author: belolourenco

Diff for: .github/workflows/set-up-environment.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Check out repository code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: Use OCaml
       uses: ocaml/setup-ocaml@v2
       with: