latest `rdkit` version is not compatible with `chebai`

[sfluegel05]

I had some problems running Chebifier with the latest rdkit version (2024.9.6):

ImportError: cannot import name 'MolToMPL' from 'rdkit.Chem.Draw' (.venv2\Lib\site-packages\rdkit\Chem\Draw\__init__.py)

MolToMPL is used in result/molplot.py to create attention plots.

I was able to fix this by reverting rdkit to version 2024.3.6

Todo

• Check if there is an alternative to MolToMPL (maybe rdkit just renamed it?)
• If not, put rdkit <=2024.3.6 in the requirements