Update CI.yml

Author: baseplate-admin

.github/workflows/CI.yml

@@ -9,7 +9,7 @@ jobs:
         strategy:
             matrix:
                 python-version:
-                    ['3.9', '3.10', '3.11', '3.12', 'pypy-3.9', 'pypy-3.10']
+                    ['3.9', '3.10', '3.11', '3.12',"3.13.0-beta.3", 'pypy-3.9', 'pypy-3.10']
         continue-on-error: true
         services:
             database: