Bump ghcr.io/devcontainers/features/docker-in-docker from 2.17.0 to 4.0.0 - #4

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, docker/build-push-action@v6.5.0, docker/metadata-action@v5.5.1, docker/setup-buildx-action@v3.6.1. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

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