i18n(de): update plugins.mdx - #4140

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: yanthomasdev/lunaria-action@06ad5ab2704d030708baf3b279ca0446b418e853. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/