[squash] bump nodejs to current version

.github/workflows/spellcheck.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Set up node
         uses: actions/setup-node@v3
         with:
-          node-version: "16"
+          node-version: "21"
       - name: Install cspell
         run: npm install --location=global cspell
       - name: Run spell checking