Log Message:
py-resolvelib: updated to 0.9.0

0.9.0 (2022-11-17)
==================

Features
--------
- A new reporter hook ``rejecting_candidate`` is added, replacing ``backtracking``.
  The hook is called every time the resolver rejects a conflicting candidate before
  trying out the next one in line.

Bug Fixes
---------
- Some valid states that were previously rejected are now accepted. This affects
  states where multiple candidates for the same dependency conflict with each
  other. The ``information`` argument passed to
  ``AbstractProvider.get_preference`` may now contain empty iterators. This has
  always been allowed by the method definition but it was previously not possible
  in practice.