arm64: keep J713 GPU/DCP non-coherent when CLIDR_EL1.LoC == 0 (fixes J713 graphics on 7.3) - #429

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache@v4, actions/checkout@v4, actions/setup-python@v5. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/