Log Message:
py-flexmock: updated to 0.12.1

Release 0.12.1

Fixed

- Flexmock Pytest plugin entrypoint missing from `setup.py`.

Release 0.12.0

Added

- Add Python 3.12 and 3.13 support.

Changed

- Add tox.ini to sdist to make the downstream testing easier.

Removed

- Drop Python 3.6 and 3.7 support.
- Drop Pytest 5.x support.

Fixed

- Fixed the pytest integration by switching from wrapping of the test runner to
 the pytest plugin system.