Update poetry to 1.4.2

There was a `'HTTPResponse' object has no attribute 'strict'` error
when building poetry inside the docker container;
python-poetry/poetry#7936
suggests it is an issue with poetry < 1.2 and not pinning urllib
to < 3.

Dockerfile

@@ -12,7 +12,7 @@ RUN pip3 install --no-cache --upgrade pip setuptools wheel
 
 COPY ./docker_context/poetry.lock .
 COPY ./docker_context/pyproject.toml .
-RUN pip3 install poetry==1.1.11
+RUN pip3 install poetry==1.4.2
 RUN poetry config virtualenvs.create false \
   && poetry install --no-interaction --no-ansi