test for recent python versions in github actions too

Author: Oliver Schoenborn

.github/workflows/test.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.5", "3.6", "3.7.7", "3.8"]
+        python-version: ["3.5", "3.6", "3.7.7", "3.8", "3.9", "3.10", "3.11"]
         os: [ubuntu-latest, macos-latest, windows-latest]
 
     steps: