Use the officially recommended way to install Poetry in CI

Author: thibaudcolas

.github/workflows/ci.yml

@@ -9,13 +9,11 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
+      - run: pipx install poetry
       - uses: actions/setup-python@v4
         with:
           python-version-file: pyproject.toml
           cache: 'poetry'
-      - uses: Gr1n/setup-poetry@v8
-        with:
-          poetry-version: '1.1.12'
       - run: pip install tox
       - run: tox -e lint,py311-dj42
   test_compatibility:
@@ -44,13 +42,11 @@ jobs:
             #   toxenv: py312-dj41
     steps:
       - uses: actions/checkout@v3
+      - run: pipx install poetry
       - uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python }}
           allow-prereleases: true
-      - uses: Gr1n/setup-poetry@v8
-        with:
-          poetry-version: '1.1.12'
       - run: pip install tox
       - run: tox -q
         env:
@@ -72,13 +68,11 @@ jobs:
       - if: steps.node-cache.outputs.cache-hit != 'true'
         run: npm ci --no-audit
       - run: npm run build
+      - run: pipx install poetry
       - uses: actions/setup-python@v4
         with:
           python-version-file: pyproject.toml
           cache: 'poetry'
-      - uses: Gr1n/setup-poetry@v8
-        with:
-          poetry-version: '1.1.12'
       - run: poetry install
       - run: poetry run django-admin runserver --settings=tests.settings.production --pythonpath=. &
       # Docs website build.