Update Node.js version in workflow

Author: cypher0n3

.github/workflows/rule-unit-tests.yml

@@ -24,7 +24,7 @@ jobs:
       - name: Set up Node
         uses: actions/setup-node@v6
         with:
-          node-version: '20'
+          node-version: '25'
 
       - name: Install dependencies
         run: npm ci