test: bump Flatcar version

Signed-off-by: Mathieu Tortuyaux <[email protected]>

Author: tormath1

hack/ci/cloud-init/controller.yaml.tpl

@@ -70,7 +70,7 @@
     IMAGE_URLS+="https://storage.googleapis.com/artifacts.k8s-staging-capi-openstack.appspot.com/test/cirros/2022-12-05/cirros-0.6.1-x86_64-disk.img,"
     IMAGE_URLS+="https://storage.googleapis.com/artifacts.k8s-staging-capi-openstack.appspot.com/test/ubuntu/2023-09-29/ubuntu-2204-kube-v1.27.2.img,"
     IMAGE_URLS+="https://storage.googleapis.com/artifacts.k8s-staging-capi-openstack.appspot.com/test/ubuntu/2024-01-10/ubuntu-2204-kube-v1.28.5.img,"
-    IMAGE_URLS+="https://storage.googleapis.com/artifacts.k8s-staging-capi-openstack.appspot.com/test/flatcar/flatcar-stable-3760.2.0-kube-v1.28.5.img,"
+    IMAGE_URLS+="https://storage.googleapis.com/artifacts.k8s-staging-capi-openstack.appspot.com/test/flatcar/flatcar-stable-3815.2.0-kube-v1.28.5.img,"
     IMAGE_URLS+="https://stable.release.flatcar-linux.net/amd64-usr/current/flatcar_production_openstack_image.img"
 
     [[post-config|$NOVA_CONF]]

test/e2e/data/e2e_conf.yaml

@@ -214,7 +214,7 @@ variables:
   SSH_USER_MACHINE: "ubuntu"
   EXP_KUBEADM_BOOTSTRAP_FORMAT_IGNITION: "true"
   # The Flatcar image produced by the image-builder
-  OPENSTACK_FLATCAR_IMAGE_NAME: "flatcar-stable-3760.2.0-kube-v1.28.5"
+  OPENSTACK_FLATCAR_IMAGE_NAME: "flatcar-stable-3815.2.0-kube-v1.28.5"
   # A plain Flatcar from the Flatcar releases server
   FLATCAR_IMAGE_NAME: "flatcar_production_openstack_image"