MAINT: update pysat compatibility

[jklenzing]

Description

Addresses #51

The RC sets a minimum pysat version, so old checks can be removed. Updates remaining TODO statement with a new more clear issue.

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

pytest

Test Configuration:

• Operating system: Mac OS X Sonoma
• Version number: Python 3.12

Checklist:

• [rc] Make sure you are merging into the develop (not main) branch
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• 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
• Any dependent changes have been merged and published in downstream modules
• Add a note to CHANGELOG.md, summarizing the changes
• Update zenodo.json file for new code contributors

[jklenzing]

@rstoneback, I caught a few inconsistencies in the RC yesterday while researching your questions. Can you take a look at this?

[jklenzing]

Completely forgot about this one during the meeting. @aburrell, can you take a look?