fix: ensure Poetry uses the correct Python environment in workflow

Author: Ki-Seki

.github/workflows/python-tests.yml

@@ -47,6 +47,8 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
         cache: 'poetry'
+    - name: Ensure Poetry uses correct Python
+      run: poetry env use $(which python)
 
     # Dependency and building tests
     - name: Install main dependencies