security: remediate 2026-07-16 audit findings - #44

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11, actions/setup-go@0c52d547c9bc32b1aa3301fd7a9cb496313a4491. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

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