Pin k8s e2e version to v1.25.11

Author: CecileRobertMichon

test/e2e/config/azure-dev.yaml

@@ -143,7 +143,7 @@ providers:
 variables:
   AKS_KUBERNETES_VERSION: "latest"
   AKS_KUBERNETES_VERSION_UPGRADE_FROM: "latest-1"
-  KUBERNETES_VERSION: "${KUBERNETES_VERSION:-stable-1.25}"
+  KUBERNETES_VERSION: "${KUBERNETES_VERSION:-v1.25.11}" # temporarily pin to v1.25.11 to workaround Calico dual stack issues
   FLATCAR_KUBERNETES_VERSION: "${FLATCAR_KUBERNETES_VERSION:-stable-1.25}"
   FLATCAR_VERSION: "${FLATCAR_VERSION:-latest}"
   ETCD_VERSION_UPGRADE_TO: "3.5.4-0"