For those wanting to know which processes need to be restarted after update,there is the appropriately named dnf needs-restarting:
Every time you update your system, your currently running applications should be restarted otherwise you will be still running those old binaries before the update.
You have 3 options how to resolve it:
I really dislike Offline Updates as I see no reason for going offline for dozens of minutes. And there is only few scripts which helps you when you want to follow option 3. Most famous is needs-restarting from yum-utils. But the output is very ... ehm ... unfriendly. And it is very slow.