Try going back to the in-poetry install

.github/workflows/pipeline.yml

@@ -28,9 +28,9 @@ jobs: # jobs. We will have two jobs (test and publish) with multiple steps.
  - name: Install dependencies # install all dependencies
  run: |
  poetry config virtualenvs.create false --local
- python -m pip install --upgrade pip wheel setuptools
+ poetry run python -m pip install --upgrade pip wheel setuptools
  # Because Poetry won't fix this https://github.com/python-poetry/poetry/issues/3433
- # python -m pip install "sgmllib3k (==1.0.0)"
+ poetry run python -m pip install --no-use-pep517 sgmllib3k
  poetry install --all-extras
  pip install pytest pylint coverage mypy coveralls
  # python -m nltk.downloader punkt stopwords