This sounds like a very similar issue to another thread.
The fix was to do the update via pacman first:
sudo pacman -Syu
That should identify the conflicting packages so that you can uninstall one before running the update again. In the above thread the conflict was:
tlp-1.7.0-1 and power-profiles-daemon-0.23-2 are in conflict
Removing tlp allowed their update to proceed.
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