Adjust python-stylecheck to sync max line length

Use same max line length of 80 chars in `flake8` as in `pycodestyle`.

Signed-off-by: Jonas Bardino <bardino@science.ku.dk>

Author: jonasbardino

.github/workflows/python-stylecheck.yml

@@ -27,4 +27,5 @@ jobs:
         with:
           python-root-list: ${{ env.CHANGED_FILES }}
           extra-pycodestyle-options: "--max-line-length=80"
+          extra-flake8-options: "--max-line-length=80"
           extra-isort-options: "-m=HANGING_INDENT"