TEST: Fix failing e2e tests with kubernetes < v1.23

Without using the right version of kubeadm.k8s.io, the
ClusterConfiguration patch for SSL does not get applied.

Author: oliwer

.gitlab-ci.yml

@@ -93,6 +93,7 @@ unit-tests:
     - wget -nv -O /usr/local/bin/kubectl https://storage.googleapis.com/kubernetes-release/release/${KUBECTL}/bin/linux/amd64/kubectl
     - chmod +x /usr/local/bin/kubectl
     - sed -i "s/K8S_VERSION/$K8S_VERSION/g" ".gitlab/kind-config.yaml"
+    - sed -i "s/KUBEADM_VER/$KUBEADM_VER/g" ".gitlab/kind-config.yaml"
     - sed -i "s~CI_REGISTRY_GO~$CI_REGISTRY_GO~g" ".gitlab/kind-config.yaml"
     - sed -i "s~FROM golang~FROM $CI_REGISTRY_GO/golang~g" "build/Dockerfile"
     - sed -i "s~FROM haproxytech/haproxy-alpine~FROM $CI_REGISTRY_GO/haproxy-alpine~g" "build/Dockerfile"
@@ -119,24 +120,30 @@ unit-tests:
 k8s_19:
   variables:
     K8S_VERSION: v1.19.16
+    KUBEADM_VER: v1beta2
   extends: .kind_deployment_schedules
 k8s_20:
   variables:
     K8S_VERSION: v1.20.15
+    KUBEADM_VER: v1beta2
   extends: .kind_deployment_schedules
 k8s_21:
   variables:
     K8S_VERSION: v1.21.12
+    KUBEADM_VER: v1beta2
   extends: .kind_deployment_schedules
 k8s_22:
   variables:
     K8S_VERSION: v1.22.9
+    KUBEADM_VER: v1beta2
   extends: .kind_deployment_schedules
 k8s_23:
   variables:
     K8S_VERSION: v1.23.6
+    KUBEADM_VER: v1beta3
   extends: .kind_deployment_schedules
 k8s_24:
   variables:
     K8S_VERSION: v1.24.3
+    KUBEADM_VER: v1beta3
   extends: .kind_deployment

.gitlab/kind-config.yaml

@@ -5,7 +5,7 @@ networking:
 # add to the apiServer certSANs the name of the docker (dind) service in order to be able to reach the cluster through it
 kubeadmConfigPatchesJSON6902:
   - group: kubeadm.k8s.io
-    version: v1beta3
+    version: KUBEADM_VER
     kind: ClusterConfiguration
     patch: |
       - op: add