Upgrade poetry installer

Author: wilbertliu

.github/workflows/ci.yml

@@ -26,7 +26,7 @@ jobs:
           python-version: "3.8"
 
       - name: Install Poetry
-        uses: snok/install-poetry@v1
+        uses: snok/install-poetry@v1.4.1
         with:
           virtualenvs-create: true
           virtualenvs-in-project: true