refactor(poller): resilient dual-stack map generation - #111

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683, shivammathur/setup-php@cf4cade2721270509d5b1c766ab3549210a39a2a. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/