ci: Update deprecated Node 20 on GHA runners (#515)

Updates workflows to use Node 24 as Node 20 is [being
deprecated](https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/).

.github/workflows/release.yml

@@ -133,9 +133,9 @@ jobs:
           merge-multiple: true
 
       - name: Set Up Node.js
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v6
         with:
-          node-version: "20"
+          node-version: "24"
 
       - run: npm ci -w js/resolc