Refresh kind cluster versions

Without this patch, we are using outdated images in kind cluster
setup.

This should fix it, by removing 1.17 cluster (which is not tested
anymore), and updating 1.19 images.

.github/kind-cluster-1.17.yaml

-kind: Cluster
-apiVersion: kind.x-k8s.io/v1alpha4
-nodes:
-- role: control-plane
-  image: kindest/node:v1.17.5
-- role: control-plane
-  image: kindest/node:v1.17.5
-- role: control-plane
-  image: kindest/node:v1.17.5
-- role: worker
-  image: kindest/node:v1.17.5
-- role: worker
-  image: kindest/node:v1.17.5

.github/kind-cluster-1.19.yaml

@@ -2,12 +2,12 @@ kind: Cluster
 apiVersion: kind.x-k8s.io/v1alpha4
 nodes:
 - role: control-plane
-  image: kindest/node:v1.19.0
+  image: kindest/node:v1.19.4
 - role: control-plane
-  image: kindest/node:v1.19.0
+  image: kindest/node:v1.19.4
 - role: control-plane
-  image: kindest/node:v1.19.0
+  image: kindest/node:v1.19.4
 - role: worker
-  image: kindest/node:v1.19.0
+  image: kindest/node:v1.19.4
 - role: worker
-  image: kindest/node:v1.19.0
+  image: kindest/node:v1.19.4