ci: bump danger tests to Node.js 24

Node.js 18 reached end-of-life in April 2025; bump the setup-node
version used for the Danger test job to current LTS so we stay on a
supported runtime and align with the Node 24 baseline GitHub will
enforce on Node-based actions starting 2026-06-02.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: vaind

.github/workflows/script-tests.yml

@@ -39,7 +39,7 @@ jobs:
 
       - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
         with:
-          node-version: '18'
+          node-version: '24'
 
       - run: node --test