As far as I can tell, this has been resolved. libdav1d was downgraded momentarily in the repo to fix some (apparent) KDE incompatibilities, and then quickly upgraded again when that downgrade started throwing this error for lots of people. If your mirrors are up to date as of today, the necessary version of libdav1d should install without any problems.
I am in the process of updating now, so if I’m wrong, I’ll know pretty soon.
This thread fairly clearly lays out what happened, if you need to know all the gritty details: