Conflicting Files: Linux-firmware

It took me a long time to get round to fixing this, way too long considering it was stopping me from updating my system on both my laptops and it wasn't exactly a hard fix.
Pretty much all I needed to do was check the arch linux forum, where it explained why the new firmware update was causing issues with pacman (package manager).

First I removed the firmware by running
sudo pacman -Rdd linux-firmware
Then reinstalled it by running
sudo pacman -Syu linux-firmware

After that, everything updated again as normal :).