fix: upgrade upstream test env to 1.28.0 (Azure#657)

Makefile

@@ -1,5 +1,5 @@
 REGISTRY ?= ghcr.io
-KIND_IMAGE ?= kindest/node:v1.25.11
+KIND_IMAGE ?= kindest/node:v1.28.0
 ifndef TAG
 	TAG ?= $(shell git rev-parse --short=7 HEAD)
 endif
@@ -44,7 +44,7 @@ GOLANGCI_LINT_BIN := golangci-lint
 GOLANGCI_LINT := $(abspath $(TOOLS_BIN_DIR)/$(GOLANGCI_LINT_BIN)-$(GOLANGCI_LINT_VER))
 
 # ENVTEST_K8S_VERSION refers to the version of k8s binary assets to be downloaded by envtest binary.
-ENVTEST_K8S_VERSION = 1.26.1
+ENVTEST_K8S_VERSION = 1.28.0
 # ENVTEST_VER is the version of the ENVTEST binary
 ENVTEST_VER = latest
 ENVTEST_BIN := setup-envtest

README.md

@@ -41,7 +41,7 @@ export this variable which specifies the number of member clusters that will be
 export MEMBER_CLUSTER_COUNT=1
 ```
 
-from the root directory of the repo run the following command, by default a hub cluster gets created which is the control plane for fleet (**The makefile uses kindest/node:v1.25.11**)
+from the root directory of the repo run the following command, by default a hub cluster gets created which is the control plane for fleet (**The makefile uses kindest/node:v1.28.0**)
 
 ```shell
 make setup-clusters

test/e2e/setup.sh

@@ -6,7 +6,7 @@ set -o pipefail
 
 # Before updating the default kind image to use, verify that the version is supported
 # by the current kind release.
-KIND_IMAGE="${KIND_IMAGE:-kindest/node:v1.25.11}"
+KIND_IMAGE="${KIND_IMAGE:-kindest/node:v1.28.0}"
 KUBECONFIG="${KUBECONFIG:-$HOME/.kube/config}"
 MEMBER_CLUSTER_COUNT=$1