python3-distro: update to version 1.9.0

python3-distro: update to version 1.9.0

- ENHANCEMENTS:

  - Refactor distro.info() method to return an InfoDict
  - Ignore the file '/etc/board-release'
  - Ignore the file '/etc/ec2_version'

- RELEASE:

  - Run Python 3.6 on Ubuntu 20.04 for CI and bump isort

- TESTS:

  - Test on modern versions of CPython and PyPy and macOS
  - Add support for ALT Linux Server 10.1 distribution
  - Add Debian Testing to the tests
  - Update archlinux resource for tests

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