PS: I saw that you're the one managing the packages (kolab-plesk) for the Plesk extension, that's why I ended up here. However, if that's something Plesk has to deal with, please let me know.

I understand that and I don't expect you to support 3rd party repos. I asked if it would be possible to change the dependencies to support higher PHP versions on CentOS 7.3 instead of limiting to PHP 5.4 only.