Update to PHP-IMAP 5.6 (when released)

[marien-probesys]

Problem

PHP-IMAP has been blocked to version 5.5 for quite a long time and prevent upgrade to Symfony 7 (because it requires Carbon 2, which requires Symfony < 7). To allow an upgrade to Symfony 7, I pinned the version of PHP-IMAP to a newer version that uses Carbon 3 (see 770eb06). However, with this solution, we are no longer informed about new version of PHP-IMAP. That could lead to security issues.

Solution

When released, update to the official PHP-IMAP 5.6. See https://github.com/Webklex/php-imap/releases (I follow the RSS feed of the releases, so I should be informed when a new version is released).