I've corrected the kernel numbering in your post, and made the title more explicit.
If you could use the output of paclog to provide a list of packages you update when SDDM breaks then it might be possible to identify the reason. The most likely reason is that you did not update the NVIDIA driver modules along with the kernel.
If you'd like a more generic troubleshooting page then read here: Computer doesn’t boot, boots to a black screen, or stops at a message.