Version 4.2.25-1 of php-horde-turba is marked for autoremoval from testing on Wed 01 Apr 2020. It depends (transitively) on php-horde-data, affected by #951537. You should try to prevent the removal by fixing these RC bugs.
Last update: 2020-02-25
Standards version of the package is outdated.
The package should be updated to follow the last version of Debian Policy
(Standards-Version 4.5.0 instead of