correct kind version from Dockerfile (#4922)

tests/Makefile

@@ -16,7 +16,7 @@ TEST_TAG                ?= latest ## The Tag to use for the test image. e.g. co
 PREFIX                  ?= nginx/nginx-ingress ## The name of the image. For example, nginx/nginx-ingress
 TAG                     ?= edge ## The tag of the image. For example, edge
 K8S_CLUSTER_NAME        ?= local ## The name used when creating/using a Kind Kubernetes cluster
-K8S_CLUSTER_VERSION     ?= $(shell grep -m1 'FROM kindest/node' < ${DOCKERFILEPATH} | cut -d ':' -f 2 | sed -e 's/^v//') ## The version used when creating a Kind Kubernetes cluster
+K8S_CLUSTER_VERSION     ?= $(shell grep -m1 'FROM kindest/node' < ${DOCKERFILEPATH} | cut -d ':' -f 2 | sed -e 's/^v//' | cut -d '@' -f 1) ## The version used when creating a Kind Kubernetes cluster
 K8S_TIMEOUT             ?= 75s ## The timeout used when creating a Kind Kubernetes cluster
 AD_SECRET               ?=
 PYTEST_ARGS             ?=