Downgrade Python

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-22.04, windows-latest]
-        python-version: [3.9]
+        python-version: [3.8]
     steps:
     - name: Checkout repository
       uses: actions/checkout@v3