Update teched-developer-garage-mcp-gateway.md - #24271

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Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-node@v4, actions/upload-artifact@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Uncovered a Shopify access token, which could lead to unauthorized e-commerce platform access and data breaches.