Update workflow for new poetry install

Author: fabaff

.github/workflows/python-package.yml

@@ -22,7 +22,7 @@ jobs:
         python-version: ${{ matrix.python-version }}
 
     - name: Install Poetry
-      uses: dschep/install-poetry-action@v1.2
+      uses: Gr1N/setup-poetry@v7
 
     - name: Cache Poetry virtualenv
       uses: actions/cache@v1