What does that mean?
It may be similar to other like this:
In which case an update is incoming, as mentioned there.
But if you really really need it now you can temporarily follow the downgrade instructions there.
Or if you have no way to download packages then you can use pacman with the cache directly via something like
sudo pacman -U /var/cache/pacman/pkg/linux-firmware-20240409.1addd7dc-any.pkg.tar.zst