ci: Test also Python 3.11 pre-releases (#19)

Author: llucax

.github/workflows/ci.yaml

@@ -12,6 +12,7 @@ jobs:
           - "3.8"
           - "3.9"
           - "3.10"
+          - "3.11-dev"
     runs-on: ${{ matrix.os }}
 
     steps: