Remove some packages requirements from requirements-tests.txt
#1337
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What does the code in this PR do / what does it improve?
After #1169, we have dropped support for python 3.8, so we do not need to further fix this package. The requirement of xedocs version is already met in base_environment so we do not need to set version of it, otherwiase there will be conflicts like: https://github.com/XENONnT/straxen/actions/runs/7953226064/job/21708925392?pr=1335
Can you briefly describe how it works?
Can you give a minimal working example (or illustrate with a figure)?