Bump org.slf4j:slf4j-simple from 2.0.19 to 2.0.20 - #906

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, actions/setup-java@v3, docker/build-push-action@v6, docker/setup-qemu-action@v3. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

setup-java v3 is deprecated and will no longer receive updates. Please migrate to actions/setup-java@v5.