Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: slackapi/slack-github-action@6c661ce58804a1a20f6dc5fbee7f0381b469e001. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/