Test with Python 3.11.0 (#498)

Author: adamchainz

.github/workflows/main.yml

@@ -22,7 +22,7 @@ jobs:
         - 3.8
         - 3.9
         - '3.10'
-        - '3.11-dev'
+        - '3.11'
 
     steps:
     - uses: actions/checkout@v3