Fix docs build for Poetry >=1.8 (#881)

readthedocs/readthedocs.org#11150
python-poetry/poetry#9025

Author: RobbeSneyders

docs/.readthedocs.yaml

@@ -16,12 +16,12 @@ build:
   jobs:
     post_create_environment:
       # Install poetry
-      - pip install poetry
+      - python -m pip install poetry
       # Tell poetry to not use a virtual environment
       - poetry config virtualenvs.create false
     post_install:
       # Install dependencies with 'docs' dependency group
-      - poetry install --with docs
+      - VIRTUAL_ENV=$READTHEDOCS_VIRTUALENV_PATH python -m poetry install --with docs
     pre_build:
       # Generate hub documentation
       - python scripts/component_readme/generate_hub.py