Fix: Correct Matplotlib Attribute Error

[joda9]

Description

This pull request addresses an issue in the plots.py module where an AttributeError is raised due to the use of a non-existent get_cmap attribute in the matplotlib.cm module.

Type of change

Please delete options that are not relevant.

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

Checklist:

• [x] New and adjusted code is formatted using the pre-commit hooks
• [ ] New and adjusted code includes type hinting now
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] 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
• [ ] The Read the Docs documentation is compiling correctly
• [ ] If new packages are needed, I added them the setup.py, and if needed the rtd_requirements.txt, the eDisGo_env.yml and the eDisGo_env_dev.yml.
• [ ] I have added new features to the corresponding whatsnew file