ci: remove old code to support old poetry version

Author: daniel-jones-dev

.gitlab-ci.yml

@@ -48,17 +48,7 @@ before_script:
   - python3 -m venv .venv
   - source .venv/bin/activate
   - pip install --upgrade pip
-  # For py3.6, stick to Poetry 1.1.15, because with Poetry 1.2.0 there is a build issue on Python 3.6:
-  # "pydantic-1.9.0-cp36-cp36m-manylinux_2_17_x86_64.manylinux2014_x86_64.whl is not a supported wheel on this platform."
-  # Note: Poetry and the project dependencies should also be installed in separate virtual-envs (that is not done here)
-  - > 
-    if [[ ! -z "${USE_OLD_POETRY_VERSION}" ]]; then
-      echo "Installing old poetry version"
-      pip install poetry==1.1.15
-    else
-      echo "Installing newer poetry version"
-      pip install poetry==2.1.2
-    fi
+  - pip install poetry==2.1.2
   - poetry --version
   - poetry install -vv -E keyring