CI fails due to new flake8-nb version
CI fails: https://gitlab.esrf.fr/workflow/ewoksapps/est/-/jobs/418908
Not sure what's going on because E402 is ignored in setup.cfg:
# E402 (module import not at top of file) ignored
[flake8_nb]
ignore = E501, E203, W503, E402
max-line-length = 88