Use latest setup-ocaml again

Author: cknitt

.github/workflows/ci.yml

@@ -54,7 +54,7 @@ jobs:
         key: ${{matrix.os}}-rescript-vscode-v4
 
     - name: Use OCaml
-      uses: ocaml/setup-ocaml@v2.1.7
+      uses: ocaml/setup-ocaml@v2
       with:
         ocaml-compiler: 4.14.x