drop 3.11 since dependencies don't support it yet

Author: petercorke

.github/workflows/main.yml

@@ -21,7 +21,7 @@ jobs:
     strategy:
       matrix:
         os: [windows-latest, ubuntu-latest, macos-latest]
-        python-version: [3.7, 3.8, 3.9, '3.10', 3.11]
+        python-version: [3.7, 3.8, 3.9, '3.10']
 
     steps:
     - name: Set up Python ${{ matrix.python-version }}