Remove use of version plugin

Author: SimonCW

.github/workflows/build-docs.yml

@@ -37,13 +37,9 @@ jobs:
           key: ${{ runner.os }}-python-${{ env.pythonLocation }}-${{ hashFiles('pyproject.toml') }}-root-docs
       - name: Install poetry
         if: steps.cache.outputs.cache-hit != 'true'
-        # TODO: remove python -m pip install --force git+https://github.com/python-poetry/poetry-core.git@ad33bc2
-        # once there's a release of Poetry 1.2.x including poetry-core > 1.1.0a6
-        # Ref: https://github.com/python-poetry/poetry-core/pull/188
         run: |
           python -m pip install --upgrade pip
           python -m pip install "poetry==1.5.1"
-          python -m poetry self add poetry-version-plugin
       - name: Configure poetry
         run: python -m poetry config virtualenvs.create false
       - name: Install Dependencies