chore(cmdeploy/dovecot): add multi-dist/Debian trixie support - #1002

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: peter-evans/repository-dispatch@ff45666b9427631e3450c54a1bcbee4d9ff4d7c0. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/