Use the right Python version for installing poetry

Author: tcompa

.github/workflows/ci_poetry.yml

@@ -34,6 +34,9 @@ jobs:
       - name: Configure poetry
         run: poetry config virtualenvs.in-project true
 
+      - name: Configure python version for poetry
+        run: poetry env use python${{ matrix.python-version }}
+
       - name: Install dependencies (without extras)
         run: poetry install --with dev --without docs --no-interaction
 
@@ -74,6 +77,9 @@ jobs:
       - name: Configure poetry
         run: poetry config virtualenvs.in-project true
 
+      - name: Configure python version for poetry
+        run: poetry env use python${{ matrix.python-version }}
+
       - name: Install dependencies (including fractal-tasks extra)
         run: poetry install --with dev --without docs --no-interaction -E fractal-tasks