[Feat] Deprecate Python 3.8, add Python 3.12 + update CI/CD

[David-GERARD]

Description

As planned for the release of version 1.24.4, we are removing support for python >3.9, and adding python 3.12 .

Type of change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Checklist:

• I have run the pre-commit checks with pre-commit run --all-files (see CONTRIBUTING.md instructions to set it up)
• I have run pytest -v and no errors are present.
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I solved any possible warnings that pytest -v has generated that are related to my code to the best of my knowledge.
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[David-GERARD]

Pygame doesn't support python 3.13 yet, and due to the number of errors in CI, I am removing it and focussing this PR on python 3.12 only.

[David-GERARD]

As per gorakhargosh/pathtools#13, pathtools, a dependancy of AgileRL doesn't build python 3.12, and it doesn't seem like they will change it (see closed PR gorakhargosh/pathtools#14).

As such:

• I removed python 3.12 from the AgileRL tutorial
• I pinned the version in requirements.txt to be <3.12
• I added a warning in the documentation in `PettingZoo/docs/tutorials/agilerl/index.md