remove 3.8 tests as it's not compatible with asyncio

Author: faviansamatha

.github/workflows/main.yml

@@ -32,7 +32,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.9", "3.10", "3.11"]
         poetry-version: ["1.8.2"]
 
     steps: