chore(gateway): bump openapi-to-mcp image to 1.0.5 (3.9) - #386

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-go@v4, engineerd/setup-kind@v0.5.0. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/