Backport from QGIS - #95

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/attest-build-provenance/predicate@1176ef556905f349f669722abf30bce1a6e16e01, actions/attest@ce27ba3b4a9a139d9a20a4a07d69fabb52f1e5bc, actions/checkout@v4, docker/build-push-action@v6, docker/login-action@v3, docker/metadata-action@v5, docker/setup-docker-action@v4, docker/setup-qemu-action@v3. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/