Update policy for kube version

We have historically decided to support AND TEST 3 versions
of kubernetes. For that, we lagged behind in terms of client versions.

Lagging behind one version allowed us, thanks to kubernetes client version skew,
to support 3 versions at relatively low cost.

However, maintaining 3 versions has always been a pain.
For that, we pinned old versions of kubernetes clients/api and test tooling.

In december 2025 community meeting, we decided to only maintain two
versions: the most current one, and the previous one.

This allows us to bump more regularly and be more secure.
We can also more easily use dependabot this way.

Signed-off-by: Jean-Philippe Evrard <open-source@a.spamming.party>

.github/dependabot.yml

@@ -10,11 +10,6 @@ updates:
     directory: "/"
     schedule:
       interval: "daily"
-    ignore:
-      - dependency-name: "k8s.io/api"
-      - dependency-name: "k8s.io/apimachinery"
-      - dependency-name: "k8s.io/client-go"
-      - dependency-name: "k8s.io/kubectl"
   - package-ecosystem: "docker"
     directory: "/"
     schedule:

.github/kind-cluster-current.yaml

@@ -2,8 +2,8 @@ kind: Cluster
 apiVersion: kind.x-k8s.io/v1alpha4
 nodes:
 - role: control-plane
-  image: "kindest/node:v1.34.0"
+  image: "kindest/node:v1.35.0"
 - role: worker
-  image: "kindest/node:v1.34.0"
+  image: "kindest/node:v1.35.0"
 - role: worker
-  image: "kindest/node:v1.34.0"
+  image: "kindest/node:v1.35.0"

.github/kind-cluster-next.yaml

@@ -1,9 +0,0 @@
-kind: Cluster
-apiVersion: kind.x-k8s.io/v1alpha4
-nodes:
-- role: control-plane
-  image: "kindest/node:v1.35.0"
-- role: worker
-  image: "kindest/node:v1.35.0"
-- role: worker
-  image: "kindest/node:v1.35.0"