Failing Python package workflow step "lint with flake8"

[thehrh]

The last successful workflow
Successfully installed flake8-7.1.2 mccabe-0.7.0 pycodestyle-2.12.1 pyflakes-3.2.0

whereas the recent unsuccessful one
Successfully installed flake8-7.2.0 mccabe-0.7.0 pycodestyle-2.13.0 pyflakes-3.3.2, resulting in

./pisa/utils/flavInt.py:115:9: F824 `global __BAR_SSEP__` is unused: name is never assigned in scope
        global __BAR_SSEP__
        ^
./pisa/utils/flavInt.py:154:5: F824 `global __BAR_SSEP__` is unused: name is never assigned in scope
    global __BAR_SSEP__
    ^
./pisa/utils/flavInt.py:2[29](https://github.com/icecube/pisa/actions/runs/14269216712/job/39998314225#step:5:30):9: F824 `global __BAR_SSEP__` is unused: name is never assigned in scope
        global __BAR_SSEP__
        ^
3     F824 `global __BAR_SSEP__` is unused: name is never assigned in scope
3
Error: Process completed with exit code 1.

[thehrh]

resolved by #853