add a build on py3.11

Author: rocco8773

.github/workflows/documentation.yml

@@ -20,7 +20,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python: ['3.8', '3.10', '3.12', '3.13']
+        python: ['3.8', '3.10', '3.11', '3.12', '3.13']
         os: [ubuntu-latest]
 
     steps: