Bump black from 20.8b1 to 24.3.0 in /libvirt

Bumps [black](https://github.com/psf/black) from 20.8b1 to 24.3.0.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](https://github.com/psf/black/commits/24.3.0)

---
updated-dependencies:
- dependency-name: black
  dependency-version: 24.3.0
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

libvirt/Pipfile

@@ -8,7 +8,7 @@ libvirt-python = ">=3.0.0"
 virt_stats = {editable = true, path = "."}
 
 [dev-packages]
-black = "==20.8b1"
+black = "==24.3.0"
 flake8 = "*"
 isort = "*"
 pylint = "*"