Upgrade `pomegranate` dependency to Python 3.13

[npatki]

Problem Description

In #645, we will add SDMetrics support for Python 3.13. However, this plan does not include the optional, pomegranate dependency because of blocking changes (in both API and how the license is shown).

Expected behavior

[Blocker] We've requested that the pomegranate library update the way their license is shown in pomegranate #1127.

Once this is done, we can allow our own pomegranate dependency to 3.13 as well. Until then, people who want to use pomegranate alongside SDMetrics will have to stick to Python 3.12 or below.

pip install sdmetrics[pomegranate]