Bump Kubernetes versions to currently supported

Author: paapug

.github/workflows/bootzooka-helm-ci.yaml

@@ -56,9 +56,9 @@ jobs:
     strategy:
       matrix:
         k8s:
-          - v1.20.7
-          - v1.21.2
-          - v1.22.4
+          - v1.33.3
+          - v1.32.7
+          - v1.31.11
     steps:
       - name: Check-out repository
         id: repo-checkout