python3-distro: update to version 1.7.0

python3-distro: update to version 1.7.0

- BACKWARD COMPATIBILITY:

  - Dropped support for EOL Pythons 2.7, 3.4 and 3.5
  - Dropped support for LSB and uname back-ends when --root-dir is
  specified
  - Moved distro.py to src/distro/distro.py

- ENHANCEMENTS:

  - Documented that distro.version() can return an empty string on
  - rolling releases
  - Documented support for Python 3.10
  - Added official support for Rocky Linux distribution
  - Added a shebang to distro.py to allow standalone execution
  - Added support for AIX platforms
  - Added compliance for PEP-561

- BUG FIXES:

  - Fixed include_uname parameter oversight
  - Fixed crash when uname -rs output is empty
  - Fixed Amazon Linux identifier in distro.id() documentation
  - Fixed OpenSuse >= 15 support
  - Fixed encoding issues when opening distro release files
  - Fixed linux_distribution regression

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