Downgrade Kubernetes version to 1.31.1 (latest supported by Magnum CAPI driver)

Author: JonnyHaystack

.github/workflows/ci.yaml

@@ -12,7 +12,7 @@ jobs:
         os:
           - ubuntu/noble
         version:
-          - 1.33.1
+          - 1.31.1
     steps:
       - uses: actions/checkout@v4