Update CI to use new maintained poetry action

.github/workflows/python-package.yml

@@ -24,10 +24,10 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install Poetry
-      uses: dschep/install-poetry-action@v1.3
+      uses: snok/install-poetry@v1.1.1
       with:
         # Version of Poetry to use
-        version: 1.0.10
+        version: 1.1.4
     - name: Install dependencies
       run: |
         poetry install