Update test-requirements.txt

[Khabib73]

Running tox -e style prints the following warning before the test session starts:

.tox/style/lib/python3.14/site-packages/pep8.py:110: FutureWarning: Possible nested set at position 1
  EXTRANEOUS_WHITESPACE_REGEX = re.compile(r'[[({] | []}),;:]')

The warning comes from the abandoned pep8 package (last release 2017), which is installed only because of the pytest-pep8 plugin declared in test-requirements.txt. pytest-pep8 is unmaintained, is not used by any tox environment, and duplicates checks already covered by pycodestyle (a dependency of flake8). Since Python 3.12, the re module flags the regex in pep8.py as a possible nested set, adding noise to every style run on newer Python versions.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.61%. Comparing base (09bb736) to head (3daa820).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #902   +/-   ##
=======================================
  Coverage   82.61%   82.61%           
=======================================
  Files          99       99           
  Lines       12945    12945           
  Branches     1268     1268           
=======================================
  Hits        10695    10695           
  Misses       1799     1799           
  Partials      451      451           

Flag	Coverage Δ
integration	80.44% <ø> (-0.04%)	⬇️
unit	48.88% <ø> (ø)

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