CI: use node v8 canary

Author: vouillon

.github/workflows/build-wasm_of_ocaml.yml

@@ -46,7 +46,7 @@ jobs:
       - name: Install node
         uses: actions/setup-node@v4
         with:
-          node-version: 23
+          node-version: 'v24.0.0-v8-canary202412116884e26428'
 
       - name: Install OCaml ${{ matrix.ocaml-compiler }}
         uses: ocaml/setup-ocaml@v3