Update Node.js version to 24 in workflow

Author: kingthorin

.github/workflows/validate.yml

@@ -25,7 +25,7 @@ jobs:
     - name: Setup Node
       uses: actions/setup-node@v5
       with:
-        node-version: '20.x'
+        node-version: 24
     - name: Install dependencies
       run: |
          npm install -g ajv-formats