Support Python 3.13

[fabasoad]

Add support for Python 3.13

[zmbc]

Hi @fabasoad, thanks so much for the PR! It looks like there are two issues here:

• This restricted shakespearelang to only be compatible with 3.13 (and above). I've corrected that in the pyproject.toml but it appears a new lockfile needs to be generated.
• It appears shakespearelang isn't currently working with 3.13, with for example this test failure:

E             - Jumping to Scene II
E             + Jumping to Scene ('', '', 'II')
E             ?                  ++++++++++  ++
E             - ----------

Up for taking a look into these issues?

[fabasoad]

Hi @zmbc! I've rebuilt lock file and pushed it to this branch. Re/ test failures - I looked at those failures this evening, but TBH proper fix for them requires internal project knowledge which I do not have at the moment unfortunately. If you have time to look at it then it would be awesome.