btw: I'd guess it's not just enough to clean up the conffile itself with the appropriate tools, but one likely needs to manually rmdir: /etc/NetworkManager/VPN as this is neither a conffile (as it's a dir) nor owned by any other package (at least on my system)... so dpkg will not remember about it and it would remain forever.
I've made the directory /etc/NetworkManager/VPN owned by the network-manager package in the mean time and will keep this at least for trixie.
I.e., you simply need to deal with the removal (and cleanup) of the conffile in network-manager-strongswan.
At some later point, once no package ships any conffiles in /etc/NetworkManager/VPN anymore, I might consider dropping this directory from the network-manager again and leave the cleanup of the directory to dpkg.
Michael
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