TST: weekly tests against Python 3.13

.github/workflows/bleeding-edge.yaml

@@ -40,7 +40,7 @@ jobs:
  # the '-dev' suffix allows to use pre-releases if no final release is available yet
  # this version should be upgraded as often as possible, typically once a year when
  # Cython, numpy and matplotlib are known to be compatible
- python-version: '3.12-dev'
+ python-version: '3.13-dev'
 
  - name: Install dependencies
  # PyYAML needs to be installed in isolation for now, because of a known