I know that there’s another topic on this, but that one was closed without a real solution.
I’m having the same problem - Discover is asking me constantly to upgrade a package called “kpeoplevcard”. The Discover update failes with no useful error message. I tried things like ‘pacman -Syuu’ with no avail (everything is up-to-date according to pacman, pamac).
For one thing … you could use the search function of the forum because this question has been asked dozens of times besides being mentioned in every update announcement for months.
For another thing - you really should not be using discover (or any version of packagekit) for package management.
Lastly … you have lots of pacnews. Use the same search-foo to learn how to handle them.
Your mirrors and your file database are probably out of sync.
sudo pacman-mirrors -f && sudo pacman -Syyuu
Note that the use of -Syyuu is only for this one occasion. As @cscs says, this problem has been addressed a gazillion times already, and it also goes back several updates already — to the 6th of November 2023, to be precise — which suggests that you haven’t been keeping your system up to date. And…
… confirms this. Therefore, please read through this short essay and draw your own conclusions…