Update libvirt-go to 7.3.0
Update libvirt-go to 7.3.0

We wish to include the following commit:
commit f1cd3791f65b17f0b4aba7dc39716ed7046448c6 (tag: v7.2.0)
Author: Vladik Romanovsky <vromanso@redhat.com>
Date:   Fri Mar 26 19:14:53 2021 -0400

    Update GetJobStats to report an accurate job type

And 7.3.0 is the first version which we can consume including
this commit.

Signed-off-by: Maya Rashish <309f5d63d2311d00fe13deb09dd851fb2714413c@redhat.com>

kubevirt/kubevirt,davidvossel/kubevirt,stu-gott/kubevirt,kubevirt/kubevirt,davidvossel/kubevirt,kubevirt/kubevirt,davidvossel/kubevirt,stu-gott/kubevirt,stu-gott/kubevirt,stu-gott/kubevirt,kubevirt/kubevirt,davidvossel/kubevirt