Test using Python 3.11 as well (#374)

https://devguide.python.org/versions/#supported-versions

Author: macbre

.github/workflows/python-ci.yml

@@ -16,11 +16,13 @@ jobs:
       fail-fast: false
       matrix:
         # https://github.com/actions/python-versions/blob/main/versions-manifest.json
+        # https://devguide.python.org/versions/#supported-versions
         python-version:
         - "3.7"
         - "3.8"
         - "3.9"
         - "3.10"
+        - "3.11"
 
     steps:
     - uses: actions/checkout@v3