Bump python in dependencies
Related MRs: schemas!42 (merged), test-tools!128 (merged)
Since CI runs now on python 3.10 - python version specified in the dependencies also should be updated. It comes from the fact, we only support and test on 3.10 and won't know when 3.8 will fail. With this MR we force all users to install our python packages with a correct and tested version of python.