buildx failed with: ERROR: failed to solve: process "/bin/sh -c pip install indico==$VERSION jsonschema==2.*" did not complete successfully: exit code: 1

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: docker/login-action@v2, docker/setup-buildx-action@v2, docker/build-push-action@v4. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.