Axelrod-Python / Axelrod / 5035

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Fix type hints for mypy 2.1

Closes #1176

Various things I've needed to do:

- In a number of places include that the type is `Optional[]`.
- In a number of places include an `assert` so that `mypy` knows that
  the type is no longer None.
- I have made a minor refactor to the Moran process, I could have used
  asserts but this actually pointed out a spot where I believe the tests
  were incorrect: we were testing a specific situation where
  `MoranProcess.birth` or `MoranProcess.death` should have been called with
  default `index=None` but was actually being tested with `index=0`.
- **I have ignored** a type hint check in `fingerprint.py`: I was
  completely unable to get this one happy

To ensure that any new PRs don't break CI let's merge this under bug fix.

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