fix(agenticopenai): upgrade OpenAI SDK to v3.56.0 - #991

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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/download-artifact@v4, actions/setup-go@v5, peter-evans/create-or-update-comment@v4, peter-evans/find-comment@v3. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/