In the spec file of the package, the sub package libvirt-daemon-driver-storage-zfs don't exists for F43 and newer. But it will needed to mange ZVOL's when using it to store the images.
But the zfs-fuse package which are noted as the reason in the spec file are not needed. Because the performance are better when using the kernel module for it.
And the zfs userspace tools are also an part of the OpenZFS package.
See:
https://openzfs.github.io/openzfs-docs/Getting%20Started/Fedora/index.html
http://download.zfsonlinux.org/fedora/43

Reproducible: Always

Steps to Reproduce:
Try to update from F42 to F43
Actual Results:
Fails because libvirt-daemon-driver-storage-zfs is missing uder F43

Expected Results:
Working upgrade

Additional Information:
Simple rebuild the package without the Fedora if block and allow build the sub package.