[pkg-php-pear] taking over php-swiftmailer for now

[Joe Nahmias]

As discussed on the mailing list in this thread:
https://alioth-lists.debian.net/pipermail/pkg-php-pear/2025-September/029506.html

I'm planning to take care of php-swiftmailer for the time being to enable
kanboard to enter testing/forky. In parallel, I will investigate moving
kanboard to symfony-mailer or change php-swiftmailer to the FriendsOfSymfony1
fork at https://github.com/FriendsOfSymfony1/swiftmailer.

--Joe