Bump node to 24 LTS (#853)

.github/dependabot.yml

@@ -31,6 +31,12 @@ updates:
     groups:
       docker-images:
         patterns: ["*"]
+    ignore:
+      # Node.js: block major-version bumps so dependabot never proposes
+      # moving from one LTS line to a non-LTS "Current" release (e.g. 24 -> 25).
+      # Node LTS is even-numbered only; major bumps should be deliberate.
+      - dependency-name: "node"
+        update-types: ["version-update:semver-major"]
 
   # GitHub Actions
   - package-ecosystem: "github-actions"