python3-distro: update to version 1.8.0

- BACKWARD COMPATIBILITY:

  - Replace setup.py with build

- ENHANCEMENTS:

  - Lowered LinuxDistribution._distro_release_info method complexity
  - Added official support for Buildroot distribution
  - Added official support for Guix distribution
  - Added support for /etc/debian_version
  - Fixed a typography in CONTRIBUTING.md
  - Improved README.md "Usage" code block

- RELEASE:

  - Bumped black to v22.3.0 in pre-commit.ci configuration
  - Enabled GitHub Dependabot to keep GitHub Actions up to date

Signed-off-by: Javier Marcet <javier@marcet.info>