Bump libvirt-python from 12.3.0 to 12.4.0

Bumps [libvirt-python](http://www.libvirt.org) from 12.3.0 to 12.4.0.

---
updated-dependencies:
- dependency-name: libvirt-python
  dependency-version: 12.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]