ci(test.mk): Use same/latest k8s version for upgrade tests

make/test.mk

@@ -10,12 +10,6 @@ E2E_TIMEOUT       ?= 120m
 # by default with DKP.
 # See https://github.com/mesosphere/kind-docker-image-automation/ for the build repo.
 E2E_KINDEST_IMAGE ?= "mesosphere/kind-node-ci:v1.26.3"
-
-# Kommander <=v2.3 does not install on Kubernetes >=v1.24 due to the introduction of
-# `LegacyServiceAccountTokenNoAutoGeneration` feature (enabled by default). This breaks self-attachment
-# and therefore the whole install process so we need to run the upgrade tests against an older version
-# of Kubernetes. This can be removed once the `UPGRADE_FROM_VERSION` below is Kommander >=v2.4.
-E2E_KINDEST_IMAGE_FOR_UPGRADE_TEST ?= "mesosphere/kind-node-ci:v1.23.9"
 UPGRADE_FROM_VERSION ?= "v2.6.0-dev"
 
 # (aweris): This should be a temporary workaround for v2.3.0 development. If you're still see clone test in v2.4.0
@@ -51,7 +45,7 @@ test.e2e.upgrade.singlecluster: kommander-e2e ; $(info $(M) running end-to-end k
 	cd $(KOMMANDER_E2E_DIR) && \
 		E2E_TEST_PATH="feature/upgrade/suites/kind/singlecluster" \
 		E2E_TIMEOUT=$(E2E_TIMEOUT) \
-		E2E_KINDEST_IMAGE=$(E2E_KINDEST_IMAGE_FOR_UPGRADE_TEST) \
+		E2E_KINDEST_IMAGE=$(E2E_KINDEST_IMAGE) \
 		E2E_KOMMANDER_APPLICATIONS_REPOSITORY="github.com/mesosphere/kommander-applications.git?ref=$(UPGRADE_FROM_VERSION)" \
 		E2E_KOMMANDER_APPLICATIONS_REPOSITORY_TO_UPGRADE="github.com/mesosphere/kommander-applications.git?ref=$(GIT_COMMIT)" \
 		VERBOSE=$(VERBOSE) \