Try using a more recent poetry version in CI

Author: mfogel

.github/workflows/ci.yml

@@ -21,7 +21,7 @@ jobs:
       - name: Install Poetry
         uses: snok/install-poetry@v1
         with:
-          version: 1.8.5
+          version: 2.2.1
           virtualenvs-create: true
           virtualenvs-in-project: true