What's Changed
* chore: run CI on Python 3.13; Officially Support Python 3.13 by hf-kklein in https://github.com/Hochfrequenz/ahbicht/pull/567
* chore: move `is_valid_expression` from `__init__.py` to own module; don't re-export in `ahbicht.content_evaluation.__init__.py` by hf-kklein in https://github.com/Hochfrequenz/ahbicht/pull/566
**Full Changelog**: https://github.com/Hochfrequenz/ahbicht/compare/v0.12.0...v0.13.0