Drop Support for Python 3.8 and 3.9

[hollenstein]

Hi, the proteobench project currently supports Python versions 3.8, 3.9, 3.10, and 3.11 (at least the tests are run on these versions).

Python 3.8 has already reached the end-of-life status, and Python 3.9 will reach end-of-life in October 2025. Since proteobench doesn't seem to be a library that would be integrated directly in other people's projects, I have the feeling it is not relevant to support Python legacy versions.

What do you think about the following changes?

• deprecate the support for Python 3.8, and 3.9, (and potentially 3.10?)
• test if we can include support for 3.12 and 3.13
• decide on one recommended version for the project, and use it
  • for the "automated release" and "stream lit test" CI/CD workflows
  • to run on the proteobench server