ci: Add builds for 3.11 and 3.13

Author: Alan Christie

.github/workflows/build.yaml

@@ -32,7 +32,9 @@ jobs:
     strategy:
       matrix:
         python-version:
+        - '3.11'
         - '3.12'
+        - '3.13'
     steps:
     - name: Checkout
       uses: actions/checkout@v4