Update Terraform libvirt to v0.7.3

Author: renovate[bot]

VM/Libvirt/Debian/provider.tf

@@ -2,7 +2,7 @@
   required_providers {
     libvirt = {
       source = "dmacvicar/libvirt"
-      version = "0.7.2"
+      version = "0.7.3"
     }
   }
 }