Description of problem:

Problem is that dav1d is build (since version 1.0.0) to compile the lib file as libdav1d.so.6 instead of libdav1d.so.5 (can be reviewed in the dav1d spec file). 
With the result on EL 9.1 that libavif can't find libdav1d.so.5 as compiled with:

# dnf install libavif
Last metadata expiration check: 0:32:40 ago on Thu 17 Nov 2022 04:19:06 AM CET.
Error: 
 Problem: conflicting requests
  - nothing provides libdav1d.so.5()(64bit) needed by libavif-0.10.1-3.el9.x86_64

Version-Release number of selected component (if applicable):

libavif-0.10.1-3.el9.x86_64
dav1d-1.0.0-2.el9.x86_64

dav1d.spec
%files -n libdav1d
%license COPYING doc/PATENTS
%{_libdir}/libdav1d.so.6*

How reproducible:

Recompile libavif with dav1d

Expected results:

Fix the issue. Recompile the package and distribute it via EPEL.