Added Python 3.13 on the test matrix. StateMachine 2.3.5 supports Python
3.7, 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13.

- Fixes
  [#469](https://github.com/fgmacedo/python-statemachine/issues/469)
compatibility with pydot 3.0.0+.
- Fixes
  [#473](https://github.com/fgmacedo/python-statemachine/issues/473)
property support for type checking.