Test against 3.11 and 3.12

Author: matthewelwell

.github/workflows/pull-request.yml

@@ -15,7 +15,7 @@ jobs:
         strategy:
             max-parallel: 4
             matrix:
-                python-version: ['3.8', '3.9', '3.10']
+                python-version: ['3.8', '3.9', '3.10', '3.11', '3.12']
 
         steps:
             - name: Cloning repo