Fix GH test action poetry installer

.github/workflows/test.yml

@@ -35,7 +35,7 @@ jobs:
         with:
           python-version: 3.8
       - name: install Poetry
-        uses: snok/install-poetry@v1.1.1
+        uses: snok/install-poetry@v1.3.4
       - name: cache Poetry virtualenv
         uses: actions/cache@v2
         id: poetry-cache