Add ADR053: Use Grafana - #264

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: lfdebrux/trello-poster-action@736f8f21f0cacf6f4142d5c9e09ebd4439e83318. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/