Code review comment for ~bryce/ubuntu/+source/exim4:merge-v4.97-3-noble

I noticed debian introduced a new dependency on libfile-fcntllock-perl, but that is in main, so it's fine.

There was also quite a lot of churn around systemd services, and /etc/default/exim4 changes, which we might want to note in the release notes, but I didn't look into all the details. The debian/NEWS file tries to explain it all. On fresh installs, /etc/default/exim4 is very different from previous versions.

Delta carried over as needed, +1