CI: Add support for Python 3.11

Author: michael-k

.github/workflows/ci.yaml

@@ -41,6 +41,7 @@ jobs:
           - '3.8'
           - '3.9'
           - '3.10'
+          - '3.11'
     steps:
       - name: Checkout
         uses: actions/checkout@v3

setup.cfg

@@ -28,6 +28,7 @@ classifiers =
   Programming Language :: Python :: 3.8
   Programming Language :: Python :: 3.9
   Programming Language :: Python :: 3.10
+  Programming Language :: Python :: 3.11
   Topic :: Software Development
   Topic :: Software Development :: Debuggers
   Topic :: Software Development :: Quality Assurance