New TurnKey phpList version (19.0)

Changes:

• Update phpList to v3.7.0 from the official upstream release and verify its published SHA-256 digest.
• Adapt the appliance to Debian 13/Trixie and PHP 8.4. Use phpList's bundled IMAP fallback because Debian no longer provides the legacy PHP IMAP extension.
• Schedule command-line queue processing and add a supervised TurnKey phpList update command.
• Upgrade the base distribution to Debian 13/Trixie.

Links

• Release meta-files (signature, manifest)