Update to libvirt-python v12.0.0

Update libvirt python bindings to v12.0.0, new APIs and constants
in libvirt 12.0.0.

References jsc#PED-14592, jsc#PED-14597, jsc#PED-14623 and jsc#PED-15320

Signed-off-by: Jim Fehlig <jfehlig@suse.com>

python-libvirt-python.spec

@@ -1,7 +1,7 @@
 #
 # spec file for package python-libvirt-python
 #
-# Copyright (c) 2026 SUSE LLC
+# Copyright (c) 2025 SUSE LLC
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed