feat: Updated sabre/dev dependency to 3.2.3

- feat: Updated nestbot/carbon to 2.0.0
- fix: Replaced zendframework/zend-validator with
  laminas/laminas-validator
- fix: Replaced zendframework/zend-stdlib with
  laminas/laminas-stdlib

tests/TaskTest.php

@@ -1,14 +1,11 @@
 <?php 
 
 use Sabre\VObject\Component\VCalendar;
-use Sabre\DAV\Exception\BadRequest;
 use Aerex\TaskwarriorPlugin\Taskwarrior\Task;
 use Aerex\TaskwarriorPlugin\Plugin;
 use Carbon\Carbon;
-use Aerex\TaskwarriorPlugin\Config;
 use Sabre\DAV\Server;
 use DateTime;
-use DateTimeZone;
 
 class TaskTest extends \PHPUnit\Framework\TestCase {