Arm backend: fix unbound ARM_SETUP_CURL_PROGRESS_ARGS under bash 3.2 - #22337

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v3, actions/setup-python@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/