types: widen RollupConfig.plugins to accept rolldown-typed plugins - #4484

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: autofix-ci/action@ff86a557419858bb967097bfc916833f5647fa8c. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/