Update Python version from 3.14-dev to 3.14

Author: baseplate-admin

.github/workflows/CI.yml

@@ -19,7 +19,7 @@ jobs:
                         '3.11',
                         '3.12',
                         '3.13',
-                        '3.14-dev',
+                        '3.14',
                         'pypy-3.9',
                         'pypy-3.10',
                         'pypy-3.11',