Merges 49 commits from coop-cloud/nextcloud upstream: nginx 1.31.6, redis
8.10.2, whiteboard v2.0.0, postgres overlay on pgautoupgrade 17, MariaDB
auto-upgrade, an optional metrics overlay, a check_major_upgrade helper,
a fix for install_collabora, and smtp-in-cron wiring. See
release/16.1.0+35.0.1-fpm for details.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>