Pytest-split

Added
- Support for pytest 8.x
- Python 3.12 to CI test matrix

Changed
- Introduce Ruff
- Fixed usage of [deprecated pytest API](https://docs.pytest.org/en/latest/deprecations.html#configuring-hook-specs-impls-using-markers)

Added
- Python 3.11 to CI test matrix

Fixed
- The `least_duration` algorithm should now split deterministically regardless of starting test order.
This should fix the main problem when running with test-randomization packages such as `pytest-randomly` or `pytest-random-order`
See 52

Added
- Support for pytest 7.x, see https://github.com/jerry-git/pytest-split/pull/47

Added
- PR template
- Test against 3.10
- Compatibility with IPython Notebooks

Added
- Wolt cookiecutter + cruft setup, see https://github.com/jerry-git/pytest-split/pull/33